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Sea temperature in United States

Live water temperatures and swimming conditions across 692 beaches on the United States coast.

Best time to swim in United States

The sea in United States peaks in July, when the water averages around 28°C.

The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.

On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.

Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.

The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.

United States sea temperature history

Long-term climatology for United States shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.

The seasonal swing is roughly 10°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.

Recent decades have trended slightly warmer at United States, in line with regional sea-surface temperature records for the wider basin.

Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.

Jan
18°C
Feb
18°C
Mar
19°C
Apr
21°C
May
23°C
Jun
26°C
Jul
28°C
Aug
28°C
Sep
27°C
Oct
25°C
Nov
22°C
Dec
19°C

Values are area averages; individual beaches vary by exposure and depth.

United States sea temperature: frequently asked questions

What is the warmest month to swim in United States?

July is the warmest month in United States, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.

When is the sea coldest in United States?

The coldest month in United States is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.

When can you swim in United States without a wetsuit?

The main swimming season in United States runs from April – November — about 8 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.

Do I need a wetsuit in United States?

Outside peak summer the water in United States drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.

What is the average sea temperature in United States?

The long-term annual mean sea temperature in United States is about 23°C, based on multi-decadal climatology of the surrounding waters.

How do I check the current sea temperature in United States?

The live reading at the top of this page shows the current sea temperature in United States, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.

United States sea temperature by month

Average sea temperatures around United States for every month of the year, based on long-term Open-Meteo marine climatology.

Monthly average sea temperature in United States
MonthAverage sea
January18.0°C
February18.0°C
March19.0°C
April21.0°C
May23.0°C
June26.0°C
July ⭐28.0°C
August28.0°C
September27.0°C
October25.0°C
November22.0°C
December19.0°C

Monthly figures are modelled climatology averages, not live readings. How accurate is our data?

Browse by state

Deep-dive hubs for the US coastal states with the most tracked beaches.

California
1,100 miles of Pacific coast, from cool NorCal breaks to warm SoCal bays.
Florida
Warm-water swimming almost year-round on two coastlines and the Keys.
Hawaii
Tropical Pacific water year-round across Oahu, Maui, Kauai and the Big Island.
New Jersey
The Jersey Shore — 130 miles of Atlantic beaches from Sandy Hook to Cape May.
North Carolina
The Outer Banks and Crystal Coast — warm Atlantic swimming from June to September.
Massachusetts
Cape Cod, the Islands and the North Shore — classic New England swimming.
South Carolina
The Grand Strand and Lowcountry — long warm swim seasons on the SC coast.
Texas
Gulf Coast beaches from South Padre to Galveston with a long warm season.
New York
Long Island's ocean shore and the Hamptons — cool but classic Atlantic swimming.
Puerto Rico
Warm Caribbean and Atlantic beaches, swimmable every month of the year.
Maine
Cold, clear Gulf of Maine water — short but memorable Atlantic swimming.
Oregon
Dramatic Pacific Northwest coastline — chilly water, spectacular beaches.
Michigan
Great Lakes beaches on Lake Michigan, Huron and Superior.
Georgia
Tybee, Jekyll and the Golden Isles — warm Lowcountry Atlantic beaches.
Washington
Pacific and Puget Sound beaches — cool water, wild scenery.

Warmest beaches in United States right now

BeachRegionSea
Fort Zachary TaylorFlorida Keys30.5°C
Bahia HondaFlorida Keys29.9°C
Jensen BeachFlorida Atlantic29.7°C
South Marco BeachFlorida Gulf29.7°C
Little Talbot BeachFlorida Atlantic29.7°C
Haulover BeachFlorida Atlantic29.6°C
Singer IslandFlorida Atlantic29.6°C
Honeymoon IslandFlorida Gulf29.6°C
Coquina BeachFlorida Gulf29.6°C
Boca GrandeFlorida Gulf29.6°C
Seaside BeachFlorida Gulf29.6°C
Rosemary BeachFlorida Gulf29.6°C
Sombrero BeachFlorida Keys29.6°C
Smathers BeachFlorida Keys29.6°C
Pompano BeachFlorida Atlantic29.6°C
Bowman's BeachFlorida Gulf29.6°C
Barefoot BeachFlorida Gulf29.6°C
Ben T. Davis BeachFlorida Gulf29.6°C
Boca Raton BeachFlorida Atlantic29.5°C
Lake Worth BeachFlorida Atlantic29.5°C
Vero BeachFlorida Atlantic29.5°C
Ormond BeachFlorida Atlantic29.5°C
Treasure IslandFlorida Gulf29.5°C
Playa SantaPuerto Rico29.5°C
Playa AzulPuerto Rico29.5°C
La ParedPuerto Rico29.5°C
Sandy PointUS Virgin Islands29.5°C
Playalinda BeachFlorida Atlantic29.5°C
Nokomis BeachFlorida Gulf29.5°C
Indian Shores BeachFlorida Gulf29.5°C
Belleair BeachFlorida Gulf29.5°C
Anclote Key BeachFlorida Gulf29.5°C
Deerfield BeachFlorida Atlantic29.4°C
New Smyrna BeachFlorida Atlantic29.4°C
Flagler BeachFlorida Atlantic29.4°C
Grayton BeachFlorida Gulf29.4°C
Higgs BeachFlorida Keys29.4°C
Shacks BeachPuerto Rico29.4°C
Melbourne BeachFlorida Atlantic29.4°C
Apollo BeachFlorida Atlantic29.4°C
Fort DeSoto BeachFlorida Gulf29.4°C
Redington BeachFlorida Gulf29.4°C
Quintana BeachTexas29.4°C
Stuart BeachFlorida Atlantic29.3°C
St Augustine BeachFlorida Atlantic29.3°C
Bradenton BeachFlorida Gulf29.3°C
Padre Balli ParkTexas29.3°C
Stewart BeachTexas29.3°C
Maho BayUS Virgin Islands29.3°C
Fred Howard Park BeachFlorida Gulf29.3°C
Palm Beach MunicipalFlorida Atlantic29.2°C
St Pete BeachFlorida Gulf29.2°C
Bowman's BeachFlorida Gulf29.2°C
Destin BeachFlorida Gulf29.2°C
St George IslandFlorida Gulf29.2°C
Port Aransas BeachTexas29.2°C
North Padre Island BeachTexas29.2°C
Playa JobosPuerto Rico29.2°C
Playa PelicanoPuerto Rico29.2°C
Playa EscondidaPuerto Rico29.2°C
Pinones BeachPuerto Rico29.2°C
Cinnamon BayUS Virgin Islands29.2°C
Bean PointFlorida Gulf29.2°C
Sanibel Island BeachFlorida Gulf29.2°C
Tigertail BeachFlorida Gulf29.2°C
Satellite BeachFlorida Atlantic29.2°C
Sunset Beach FLFlorida Gulf29.2°C
Padre Island National SeashoreTexas29.2°C
South BeachFlorida Atlantic29.1°C
Mid BeachFlorida Atlantic29.1°C
Bal Harbour BeachFlorida Atlantic29.1°C
Daytona BeachFlorida Atlantic29.1°C
Atlantic Beach FLFlorida Atlantic29.1°C
Corpus Christi BeachTexas29.1°C
Playa NegraPuerto Rico29.1°C
Seven Seas BeachPuerto Rico29.1°C
Ocean Park BeachPuerto Rico29.1°C
Lindquist BeachUS Virgin Islands29.1°C
Holmes BeachFlorida Gulf29.1°C
Bonita BeachFlorida Gulf29.1°C
Blowing Rocks PreserveFlorida Atlantic29.1°C
Anastasia State BeachFlorida Atlantic29.1°C
Surfside Beach TXTexas29.1°C
Fort De SotoFlorida Gulf29.0°C
Siesta KeyFlorida Gulf29.0°C
Marco Island BeachFlorida Gulf29.0°C
Panama City BeachFlorida Gulf29.0°C
Mexico BeachFlorida Gulf29.0°C
Isla BlancaTexas29.0°C
Crystal BeachTexas29.0°C
Galveston BeachTexas29.0°C
Hawksnest BayUS Virgin Islands29.0°C
Lowdermilk BeachFlorida Gulf29.0°C
Hutchinson IslandFlorida Atlantic29.0°C
Lummus Park BeachFlorida Atlantic29.0°C
Sebastian Street BeachFlorida Atlantic29.0°C
Madeira BeachFlorida Gulf28.9°C
Fort Myers BeachFlorida Gulf28.9°C
Sun BayPuerto Rico28.9°C
Caracas BeachPuerto Rico28.9°C
Caja de MuertosPuerto Rico28.9°C
Salt Pond BayUS Virgin Islands28.9°C
Buck IslandUS Virgin Islands28.9°C
Midtown Beach Palm BeachFlorida Atlantic28.9°C
Boca Chica BeachTexas28.9°C
North BeachFlorida Atlantic28.8°C
Indian Rocks BeachFlorida Gulf28.8°C
Pensacola BeachFlorida Gulf28.8°C
Mustang IslandTexas28.8°C
Matagorda BeachTexas28.8°C
Half Moon BayCentral California28.8°C
Buye BeachPuerto Rico28.8°C
Playa Mar ChiquitaPuerto Rico28.8°C
Coki BeachUS Virgin Islands28.8°C
Boynton BeachFlorida Atlantic28.8°C
Daytona Beach ShoresFlorida Atlantic28.8°C
Matagorda BeachTexas28.8°C
Hallandale BeachFlorida Atlantic28.7°C
Juno BeachFlorida Atlantic28.7°C
Caladesi IslandFlorida Gulf28.7°C
Englewood BeachFlorida Gulf28.7°C
Vanderbilt BeachFlorida Gulf28.7°C
South Padre IslandTexas28.7°C
Rockport BeachTexas28.7°C
Mustang Island BeachTexas28.7°C
Mustang Island BeachTexas28.7°C
Cerro GordoPuerto Rico28.7°C
Playa El ConventoPuerto Rico28.7°C
Domes BeachPuerto Rico28.7°C
Cane BayUS Virgin Islands28.7°C
Amelia IslandFlorida Atlantic28.7°C
Indialantic BeachFlorida Atlantic28.7°C
Ponce Inlet BeachFlorida Atlantic28.7°C
Jamaica BeachTexas28.7°C
Sea Rim State ParkTexas28.7°C
Jupiter BeachFlorida Atlantic28.6°C
Cocoa BeachFlorida Atlantic28.6°C
Jacksonville BeachFlorida Atlantic28.6°C
Neptune BeachFlorida Atlantic28.6°C
Clearwater BeachFlorida Gulf28.6°C
Pass-a-GrilleFlorida Gulf28.6°C
Lido KeyFlorida Gulf28.6°C
Turtle BeachFlorida Gulf28.6°C
Navarre BeachFlorida Gulf28.6°C
North Padre IslandTexas28.6°C
Surfside Beach TXTexas28.6°C
Boqueron BeachPuerto Rico28.6°C
Playa Punta SantiagoPuerto Rico28.6°C
North Shore Open SpaceFlorida Atlantic28.6°C
Vilano BeachFlorida Atlantic28.6°C
Ponte Vedra BeachFlorida Atlantic28.6°C
Fernandina BeachFlorida Atlantic28.6°C
Venice Beach FLFlorida Gulf28.6°C
Sand KeyFlorida Gulf28.5°C
Captiva BeachFlorida Gulf28.5°C
Naples Pier BeachFlorida Gulf28.5°C
Miramar BeachFlorida Gulf28.5°C
Galveston East BeachTexas28.5°C
Zoni BeachPuerto Rico28.5°C
Fort Pierce Inlet BeachFlorida Atlantic28.5°C
Delnor-Wiggins Pass BeachFlorida Gulf28.5°C
Caspersen BeachFlorida Gulf28.5°C
Turtle Beach Siesta KeyFlorida Gulf28.5°C
Hollywood BeachFlorida Atlantic28.4°C
Cape Canaveral BeachFlorida Atlantic28.4°C
Manasota KeyFlorida Gulf28.4°C
St Andrews State ParkFlorida Gulf28.4°C
Playa Carlos RosarioPuerto Rico28.4°C
Gilligan's IslandPuerto Rico28.4°C
Isla Verde BeachPuerto Rico28.4°C
Steps BeachPuerto Rico28.4°C
Dania BeachFlorida Atlantic28.4°C
Lauderdale-by-the-Sea BeachFlorida Atlantic28.4°C
Amelia Island BeachFlorida Atlantic28.4°C
Turner BeachFlorida Gulf28.4°C
Longboat Key BeachFlorida Gulf28.4°C
Sunny Isles BeachFlorida Atlantic28.3°C
Fort Lauderdale BeachFlorida Atlantic28.3°C
Bathtub Reef BeachFlorida Atlantic28.3°C
Sebastian InletFlorida Atlantic28.3°C
Palm Beach Public BeachFlorida Atlantic28.3°C
Crescent Beach FLFlorida Atlantic28.3°C
Crane BeachMassachusetts28.2°C
Biloxi BeachMississippi27.7°C
Gulfport BeachMississippi27.7°C
Grand Haven BeachMichigan27.7°C
Papohaku BeachHawaii27.7°C
Bradford BeachWisconsin27.7°C
Misquamicut State BeachRhode Island27.7°C
Ship IslandMississippi27.7°C
Tawas PointMichigan27.7°C
Panther BeachCalifornia27.7°C
Ludington BeachMichigan27.7°C
Ko Olina LagoonsHawaii27.6°C
Edisto BeachSouth Carolina27.6°C
Hilton HeadSouth Carolina27.6°C
Makaha BeachHawaii27.6°C
Kapalua BayHawaii27.6°C
Cannon BeachOregon27.6°C
North Avenue BeachIllinois27.6°C
Old Orchard BeachMaine27.6°C
Lincolnville BeachMaine27.6°C
Pescadero State BeachCalifornia27.6°C
Manresa State BeachCalifornia27.6°C
Windansea BeachCalifornia27.6°C
Fort Morgan BeachAlabama27.6°C
Whitefish DunesWisconsin27.6°C
Hulopoe BayHawaii27.6°C
Goat Rock BeachCalifornia27.6°C
Poplar BeachCalifornia27.6°C
San Gregorio State BeachCalifornia27.6°C
Petoskey State ParkMichigan27.6°C
Waimanalo BeachHawaii27.5°C
Polihale BeachHawaii27.5°C
Seaside Beach OregonOregon27.5°C
Ruby BeachWashington27.5°C
Sanibel LighthouseFlorida27.5°C
Delray BeachFlorida27.5°C
Higgins BeachMaine27.5°C
Silver SandsConnecticut27.5°C
Henderson BeachFlorida Panhandle27.5°C
Bolinas BeachCalifornia27.5°C
Tybee IslandGeorgia27.5°C
Jekyll IslandGeorgia27.5°C
Sea Island BeachGeorgia27.5°C
Turtle BayHawaii27.5°C
Drakes BeachCalifornia27.5°C
Del Monte BeachCalifornia27.5°C
Surfside BeachSouth Carolina27.5°C
Rockaway Beach OROregon27.5°C
Cedar Point BeachOhio27.5°C
Waimea BayHawaii27.4°C
North Myrtle BeachSouth Carolina27.4°C
Orange BeachAlabama27.4°C
Assateague BeachMaryland27.4°C
Misquamicut BeachRhode Island27.4°C
Hapuna BeachHawaii27.4°C
Lydgate BeachHawaii27.4°C
Newport Beach OregonOregon27.4°C
Lido BeachFlorida27.4°C
Lovers KeyFlorida27.4°C
Mothers BeachMaine27.4°C
Calf Pasture BeachConnecticut27.4°C
Sunset State BeachCalifornia27.4°C
Bay St. Louis BeachMississippi27.4°C
Pass Christian BeachMississippi27.4°C
Empire BeachMichigan27.4°C
Dewey BeachDelaware27.4°C
Seacliff State BeachCalifornia27.4°C
Panama City BeachFlorida Panhandle27.4°C
Hanauma BayHawaii27.3°C
Sandy BeachHawaii27.3°C
Sunset BeachHawaii27.3°C
Magic SandsHawaii27.3°C
Punaluu Black SandHawaii27.3°C
Kaanapali BeachHawaii27.3°C
Long Beach WAWashington27.3°C
Oak Street BeachIllinois27.3°C
Wallis SandsNew Hampshire27.3°C
Hammonasset BeachConnecticut27.3°C
Ocean Beach ParkConnecticut27.3°C
Cape San BlasFlorida Panhandle27.3°C
Montara State BeachCalifornia27.3°C
Cumberland IslandGeorgia27.3°C
Gold BeachOregon27.3°C
Wilderness State ParkMichigan27.3°C
Pupukea BeachHawaii27.3°C
First LandingVirginia27.3°C
Fenwick IslandDelaware27.3°C
Doran BeachCalifornia27.3°C
Manchester State BeachCalifornia27.3°C
Seabright BeachCalifornia27.3°C
Salt Pond BeachHawaii27.3°C
Nye BeachOregon27.3°C
Ala Moana BeachHawaii27.2°C
Kua BayHawaii27.2°C
Kiawah BeachSouth Carolina27.2°C
Big BeachMaui27.2°C
Sleeping Bear BeachMichigan27.2°C
Mauna Kea BeachHawaii27.2°C
Tunnels BeachHawaii27.2°C
Manzanita BeachOregon27.2°C
Pere Marquette BeachMichigan27.2°C
Anna Maria BeachFlorida27.2°C
Carpinteria BeachCalifornia27.2°C
Compo BeachConnecticut27.2°C
Narragansett Town BeachRhode Island27.2°C
Muir BeachCalifornia27.2°C
Kiawah BeachwalkerSouth Carolina27.2°C
Fripp IslandSouth Carolina27.2°C
Driftwood BeachGeorgia27.2°C
Agate BeachOregon27.2°C
Ocean City BeachMaryland27.2°C
Half Moon Bay State BeachCalifornia27.2°C
Cowell BeachCalifornia27.2°C
Marina State BeachCalifornia27.2°C
Cape San Blas BeachFlorida Panhandle27.2°C
Myrtle Beach State ParkSouth Carolina27.2°C
Laniakea BeachHawaii27.2°C
D.T. Fleming BeachMaui27.2°C
Seabrook IslandSouth Carolina27.1°C
Hilton Head BeachSouth Carolina27.1°C
Watch Hill BeachRhode Island27.1°C
Hanalei BayHawaii27.1°C
Oval BeachMichigan27.1°C
Camp HelenFlorida Panhandle27.1°C
Pacifica State BeachCalifornia27.1°C
Little TybeeGeorgia27.1°C
Yachats State ParkOregon27.1°C
Cape Charles BeachVirginia27.1°C
Cape HenlopenDelaware27.1°C
Its BeachCalifornia27.1°C
Twin Lakes State BeachCalifornia27.1°C
First Beach La PushWashington27.1°C
Third Beach La PushWashington27.1°C
Myrtle BeachSouth Carolina27.0°C
Sanibel BeachFlorida27.0°C
Lanikai BeachHawaii27.0°C
Lincoln City BeachOregon27.0°C
Bandon BeachOregon27.0°C
Wells BeachMaine27.0°C
Seabrook BeachNew Hampshire27.0°C
Rocky Neck State ParkConnecticut27.0°C
Pomponio State BeachCalifornia27.0°C
Moss Landing State BeachCalifornia27.0°C
Napili BayMaui27.0°C
Fort Morgan BeachAlabama27.0°C
Grand Isle BeachLouisiana27.0°C
Makalawena BeachHawaii26.9°C
Bellows BeachHawaii26.9°C
Wailea BeachHawaii26.9°C
Ogunquit BeachMaine26.9°C
Hunting IslandSouth Carolina26.9°C
Dauphin IslandAlabama26.9°C
Warren DunesMichigan26.9°C
China BeachCalifornia26.9°C
Waikiki BeachHawaii26.8°C
PipelineHawaii26.8°C
Pawleys IslandSouth Carolina26.8°C
Isle of PalmsSouth Carolina26.8°C
Hamoa BeachMaui26.8°C
Presque Isle BeachPennsylvania26.8°C
Footbridge BeachMaine26.8°C
Kennebunk BeachMaine26.8°C
Goose Rocks BeachMaine26.8°C
Reid State ParkMaine26.8°C
Echo Lake BeachMaine26.8°C
Hampton BeachNew Hampshire26.8°C
North Hampton State BeachNew Hampshire26.8°C
Gray Whale CoveCalifornia26.8°C
St. Simons BeachGeorgia26.8°C
Polihua BeachHawaii26.8°C
Bean Hollow State BeachCalifornia26.8°C
Waddell BeachCalifornia26.8°C
Okaloosa Island BeachFlorida Panhandle26.8°C
Perdido Key BeachFlorida Panhandle26.8°C
Litchfield BeachSouth Carolina26.8°C
Chun's Reef BeachHawaii26.8°C
Litchfield BeachSouth Carolina26.7°C
Virginia BeachVirginia26.7°C
Pacific City BeachOregon26.7°C
Poipu BeachHawaii26.7°C
Kailua BeachHawaii26.7°C
Bowman's BeachFlorida26.7°C
Sandy Point BeachMaine26.7°C
WaterColor BeachFlorida Panhandle26.7°C
Inlet BeachFlorida Panhandle26.7°C
Morro StrandCalifornia26.7°C
Limantour BeachCalifornia26.7°C
Bodega Bay BeachCalifornia26.7°C
Salinas River State BeachCalifornia26.7°C
Makapuu BeachHawaii26.7°C
Little Beach MauiMaui26.7°C
Traverse City BeachMichigan26.7°C
Kee BeachHawaii26.6°C
Topsail BeachNorth Carolina26.6°C
Gulf Shores BeachAlabama26.6°C
Rehoboth BeachDelaware26.6°C
Sandbridge BeachVirginia26.6°C
Indiana Dunes BeachIndiana26.6°C
Ecola BeachOregon26.6°C
Hookipa BeachHawaii26.6°C
Silver BeachMichigan26.6°C
Pine Point BeachMaine26.6°C
Sand BeachMaine26.6°C
Jenness State BeachNew Hampshire26.6°C
Scarborough State BeachRhode Island26.6°C
San Simeon State BeachCalifornia26.6°C
Perdido KeyAlabama26.6°C
Mokuleia BeachHawaii26.6°C
Chincoteague BeachVirginia26.6°C
Point Reyes Beach NorthCalifornia26.6°C
Big River BeachCalifornia26.6°C
Zmudowski State BeachCalifornia26.6°C
Sunset Beach NCNorth Carolina26.6°C
Coligny Beach ParkSouth Carolina26.6°C
Surf City NCNorth Carolina26.5°C
Avon BeachNorth Carolina26.5°C
Kill Devil HillsNorth Carolina26.5°C
Duck BeachNorth Carolina26.5°C
Folly BeachSouth Carolina26.5°C
Bethany BeachDelaware26.5°C
Popham BeachMaine26.5°C
Pemaquid BeachMaine26.5°C
Easton's BeachRhode Island26.5°C
Shell IslandFlorida Panhandle26.5°C
Ocean BeachCalifornia26.5°C
Gulf State ParkAlabama26.5°C
Kalaloch BeachWashington26.5°C
Ehukai BeachHawaii26.5°C
Marshall's BeachCalifornia26.5°C
Rodeo BeachCalifornia26.5°C
Salmon Creek BeachCalifornia26.5°C
Bonny Doon BeachCalifornia26.5°C
Corcoran Lagoon BeachCalifornia26.5°C
Rio Del Mar State BeachCalifornia26.5°C
Cherry Grove BeachSouth Carolina26.5°C
Yachats State Recreation AreaOregon26.5°C
Headlands Beach OHOhio26.5°C
Garden City BeachSouth Carolina26.4°C
Sullivan's IslandSouth Carolina26.4°C
Naples BeachFlorida26.4°C
Cape Hatteras BeachNorth Carolina26.4°C
Drakes Island BeachMaine26.4°C
Sherwood IslandConnecticut26.4°C
Driessen BeachSouth Carolina26.4°C
East BeachGeorgia26.4°C
Ocean ShoresWashington26.4°C
Holland State ParkMichigan26.4°C
Halawa BeachHawaii26.4°C
Chic's BeachVirginia26.4°C
Mavericks BeachCalifornia26.4°C
New Brighton State BeachCalifornia26.4°C
Sleeping Bear BeachMichigan26.4°C
Nags HeadNorth Carolina26.3°C
Coligny BeachSouth Carolina26.3°C
Rodanthe BeachNorth Carolina26.3°C
Rialto BeachWashington26.3°C
Emerald Isle BeachNorth Carolina26.3°C
Alki BeachWashington26.3°C
Van Damme BeachCalifornia26.3°C
Natural Bridges State BeachCalifornia26.3°C
Sunny Cove BeachCalifornia26.3°C
Ocean Isle BeachNorth Carolina26.3°C
Diamond Head BeachOahu26.3°C
Cumberland Island BeachGeorgia26.3°C
Kitty Hawk BeachNorth Carolina26.2°C
Ocracoke BeachNorth Carolina26.2°C
Holden BeachNorth Carolina26.2°C
Carolina BeachNorth Carolina26.1°C
Bogue Banks Salter PathNorth Carolina26.1°C
Bald Head Island BeachNorth Carolina26.0°C
Oak Island BeachNorth Carolina26.0°C
Corolla BeachNorth Carolina25.9°C
Buxton BeachNorth Carolina25.9°C
Kure BeachNorth Carolina25.7°C
Hatteras BeachNorth Carolina25.7°C
Atlantic BeachNorth Carolina25.7°C
Fort Fisher BeachNorth Carolina25.7°C
Fort Macon BeachNorth Carolina25.6°C
Wrightsville BeachNorth Carolina25.4°C
Emerald IsleNorth Carolina25.4°C
Frisco BeachNorth Carolina25.4°C
Ocean City NJNew Jersey21.7°C
Malibu Colony BeachSouthern California21.7°C
La Costa BeachSouthern California21.7°C
Marina del Rey BeachSouthern California21.7°C
Victoria BeachSouthern California21.7°C
Aliso BeachSouthern California21.7°C
Sunset CliffsSouthern California21.7°C
San Clemente PierSouthern California21.6°C
Crystal CoveSouthern California21.6°C
Spring Lake BeachNew Jersey21.6°C
Amarillo BeachSouthern California21.6°C
Cardiff ReefSouthern California21.6°C
Mission BeachSouthern California21.5°C
Del Mar BeachSouthern California21.5°C
Bolsa ChicaSouthern California21.5°C
Manasquan BeachNew Jersey21.5°C
Sea Isle CityNew Jersey21.5°C
La Piedra State BeachSouthern California21.5°C
Puerco BeachSouthern California21.5°C
Carbon BeachSouthern California21.5°C
Las Tunas State BeachSouthern California21.5°C
Belmont Shore BeachSouthern California21.5°C
Corona del Mar State BeachSouthern California21.5°C
Capistrano BeachSouthern California21.5°C
North Beach San ClementeSouthern California21.5°C
Buccaneer BeachSouthern California21.5°C
South Carlsbad State BeachSouthern California21.5°C
Imperial BeachSouthern California21.5°C
Ship Bottom BeachNew Jersey21.5°C
Salt CreekSouthern California21.4°C
Redondo BeachSouthern California21.4°C
Manhattan BeachSouthern California21.4°C
Point DumeSouthern California21.4°C
Lavallette BeachNew Jersey21.4°C
Brigantine BeachNew Jersey21.4°C
Cape May BeachNew Jersey21.4°C
Dog Beach San DiegoSouthern California21.4°C
Loveladies BeachNew Jersey21.4°C
Balboa BeachSouthern California21.3°C
Santa Monica BeachSouthern California21.3°C
Seaside HeightsNew Jersey21.3°C
1000 Steps BeachSouthern California21.3°C
Baby BeachSouthern California21.3°C
Longport BeachNew Jersey21.3°C
Coronado BeachSouthern California21.2°C
Seal BeachSouthern California21.2°C
DockweilerSouthern California21.2°C
Surfrider BeachSouthern California21.2°C
Asbury Park BeachNew Jersey21.2°C
Sunset Beach NJNew Jersey21.2°C
Tamarack BeachSouthern California21.2°C
Del Mar City BeachSouthern California21.2°C
Island Beach State ParkNew Jersey21.2°C
Beach HavenNew Jersey21.1°C
El Pescador State BeachSouthern California21.1°C
Escondido BeachSouthern California21.1°C
Dan Blocker BeachSouthern California21.1°C
Silver Strand State BeachSouthern California21.1°C
Mantoloking BeachNew Jersey21.1°C
Solana BeachSouthern California21.0°C
Doheny State BeachSouthern California21.0°C
Huntington BeachSouthern California21.0°C
Long Beach IslandNew Jersey21.0°C
Wildwood BeachNew Jersey21.0°C
Point Fermin BeachSouthern California21.0°C
Royal Palms BeachSouthern California21.0°C
Alamitos BeachSouthern California21.0°C
Huntington State BeachSouthern California21.0°C
Little Corona BeachSouthern California21.0°C
Woods CoveSouthern California21.0°C
D Street BeachSouthern California21.0°C
Bay Head BeachNew Jersey21.0°C
Surf City Beach NJNew Jersey21.0°C
Carlsbad State BeachSouthern California20.9°C
Laguna Main BeachSouthern California20.9°C
Crescent BaySouthern California20.9°C
Westward BeachSouthern California20.9°C
Sunset BeachSouthern California20.9°C
Poche BeachSouthern California20.9°C
Ocean Grove BeachNew Jersey20.9°C
Wildwood Crest BeachNew Jersey20.9°C
Hermosa BeachSouthern California20.8°C
Venice BeachSouthern California20.8°C
Sandy HookNew Jersey20.8°C
Long Branch BeachNew Jersey20.8°C
Corral BeachSouthern California20.8°C
Grand Avenue BeachSouthern California20.8°C
Children's Pool BeachSouthern California20.8°C
Cabrillo BeachSouthern California20.7°C
Belmar BeachNew Jersey20.7°C
Point Pleasant BeachNew Jersey20.7°C
Margate BeachNew Jersey20.7°C
Thousand Steps BeachSouthern California20.7°C
Shaw's CoveSouthern California20.7°C
Barnegat Light BeachNew Jersey20.7°C
Pacific BeachSouthern California20.6°C
Cardiff State BeachSouthern California20.6°C
Moonlight BeachSouthern California20.6°C
Swami'sSouthern California20.6°C
TrestlesSouthern California20.6°C
Atlantic City BeachNew Jersey20.6°C
Ventnor BeachNew Jersey20.6°C
Avalon BeachNew Jersey20.6°C
Montauk BeachNew York20.6°C
El Matador State BeachSouthern California20.6°C
Ponto BeachSouthern California20.6°C
Ocean Beach San DiegoSouthern California20.6°C
Fiesta IslandSouthern California20.6°C
Bradley BeachNew Jersey20.6°C
Two Mile Hollow BeachNew York20.6°C
Woodlawn BeachNew York20.6°C
La Jolla ShoresSouthern California20.5°C
Oceanside BeachSouthern California20.5°C
Leo CarrilloSouthern California20.5°C
Cooper's BeachNew York20.5°C
Deal BeachNew Jersey20.5°C
Harvey Cedars BeachNew Jersey20.5°C
Cherry Grove BeachNew York20.5°C
La Jolla CoveSouthern California20.4°C
Newport BeachSouthern California20.4°C
Long BeachSouthern California20.4°C
Will RogersSouthern California20.4°C
Topanga BeachSouthern California20.4°C
Stone HarborNew Jersey20.4°C
Nicholas Canyon BeachSouthern California20.4°C
Paradise CoveSouthern California20.4°C
Latigo Shore BeachSouthern California20.4°C
Torrance BeachSouthern California20.4°C
San Onofre State BeachSouthern California20.4°C
Fletcher CoveSouthern California20.4°C
Torrey Pines State BeachSouthern California20.4°C
Black's BeachSouthern California20.3°C
Zuma BeachSouthern California20.3°C
Long Beach NYNew York20.3°C
North Wildwood BeachNew Jersey20.3°C
Main Beach East HamptonNew York20.2°C
Rockaway BeachNew York20.1°C
Westhampton BeachNew York20.1°C
Robert MosesNew York20.0°C
Gilgo BeachNew York20.0°C
Fire Island BeachNew York20.0°C
Sunset Bay BeachNew York20.0°C
Brighton BeachNew York19.8°C
Kismet BeachNew York19.8°C
Ditch PlainsNew York19.7°C
Ponquogue BeachNew York19.7°C
Georgica BeachNew York19.7°C
Coney IslandNew York19.6°C
Jones BeachNew York19.6°C
Point Lookout BeachNew York19.6°C
Cupsogue BeachNew York19.5°C
Kirk Park BeachNew York19.5°C
Fire IslandNew York19.4°C
Smith Point BeachNew York19.4°C
WingaersheekMassachusetts18.7°C
Aquinnah Public BeachMassachusetts18.7°C
Revere BeachMassachusetts18.6°C
Marconi BeachMassachusetts18.6°C
Cold Storage BeachMassachusetts18.6°C
Steps BeachMassachusetts18.6°C
Singing BeachMassachusetts18.5°C
Horseneck BeachMassachusetts18.5°C
Mayflower BeachMassachusetts18.5°C
South Beach EdgartownMassachusetts18.5°C
Head of the Meadow BeachMassachusetts18.4°C
Skaket BeachMassachusetts18.4°C
Salisbury BeachMassachusetts18.4°C
Good Harbor BeachMassachusetts18.2°C
Surfside Beach NantucketMassachusetts18.2°C
Longnook BeachMassachusetts18.2°C
Nantasket BeachMassachusetts18.1°C
Herring CoveMassachusetts18.1°C
Old Silver BeachMassachusetts18.1°C
Corn Hill BeachMassachusetts18.0°C
Menemsha BeachMassachusetts18.0°C
Cahoon Hollow BeachMassachusetts17.9°C
Newcomb Hollow BeachMassachusetts17.9°C
Craigville BeachMassachusetts17.8°C
Nauset BeachMassachusetts17.8°C
Craigville BeachMassachusetts17.8°C
Coast Guard BeachMassachusetts17.7°C
West Dennis BeachMassachusetts17.7°C
Old Silver BeachMassachusetts17.6°C
Race PointMassachusetts17.6°C
Madaket BeachMassachusetts17.4°C
White Crest BeachMassachusetts17.4°C
Kalmus BeachMassachusetts17.4°C
Sea Street BeachMassachusetts17.4°C
Menauhant BeachMassachusetts17.4°C
Surf Drive BeachMassachusetts17.3°C
Cisco BeachMassachusetts17.3°C
Duxbury BeachMassachusetts17.3°C
Refugio State BeachCentral California16.7°C
La Conchita BeachCentral California16.6°C
Solimar BeachCentral California16.6°C
Jalama BeachCentral California16.5°C
Pismo BeachCentral California16.4°C
Willow Creek BeachCentral California16.4°C
Rincon BeachCentral California16.4°C
Silver Strand Beach VenturaCentral California16.4°C
Cayucos BeachCentral California16.3°C
Santa Cruz Main BeachCentral California16.3°C
Grover BeachCentral California16.3°C
Capitola BeachCentral California16.2°C
Oceano DunesCentral California16.2°C
El Capitan State BeachCentral California16.2°C
Jade CoveCentral California16.1°C
East BeachCentral California16.1°C
Avila BeachCentral California16.0°C
Carmel BeachCentral California16.0°C
Monterey State BeachCentral California16.0°C
Pfeiffer BeachCentral California15.9°C
Monastery BeachCentral California15.9°C
Sand Dollar BeachCentral California15.9°C
West BeachCentral California15.9°C
Arroyo Burro BeachCentral California15.8°C
Faria BeachCentral California15.8°C
East Beach Santa BarbaraCentral California15.7°C
Morro Bay BeachCentral California15.7°C
Stinson BeachCentral California15.7°C
Baker BeachCentral California15.7°C
Leadbetter BeachCentral California15.7°C
Hollywood Beach OxnardCentral California15.7°C
Mondos CoveCentral California15.6°C
Butterfly BeachCentral California15.5°C
Moonstone BeachCentral California15.5°C
Carmel River State BeachCentral California15.4°C
Ventura BeachCentral California15.4°C
Emma Wood State BeachCentral California15.4°C

Sea temperature in United States — FAQ

How warm is the sea in United States in September?

The sea off United States averages about 27.0°C in September, based on long-term monthly averages for this coast.

When is the best time to swim in United States?

United States is warmest in July (around 28.0°C) and coldest in January (around 18.0°C). There are typically 7 months a year when the water sits above 22°C.

What is the average yearly sea temperature in United States?

Across all twelve months, the sea in United States averages about 22.8°C.

Do you need a wetsuit to swim in United States?

In peak season (around July, ~28.0°C) most swimmers are comfortable without a wetsuit. Outside summer, when the water drops toward 18.0°C, a 3/2mm to 5/4mm wetsuit is recommended.