Where is the sea coldest in United States in September?

East Beach Santa Barbara in United States has the coldest sea in United States in September, averaging about 16.0 °C. Butterfly Beach (16.0 °C) and Refugio State Beach are the next coolest.

How many beaches in United States are warm enough to swim in September?

None of the top 25 ranked beaches in United States reach 22 °C in September, so a wetsuit is recommended for anything longer than a quick dip.

How are these September sea temperatures calculated?

Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.

Seasonal ranking

Coldest sea temperature in United States in September

Where the sea is coolest across United States during September, ranked by long-term monthly average water temperature. East Beach Santa Barbara (Central California, United States) is the coolest at around 16°C. Open any spot for today's live water temperature and a 7-day swim forecast.

1
East Beach Santa Barbara
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
2
Butterfly Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
3
Refugio State Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
4
Pismo Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
5
Avila Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
6
Morro Bay Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
7
Cayucos Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
8
Carmel Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
9
Monterey State Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
10
Santa Cruz Main Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
11
Capitola Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
12
Pfeiffer Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
13
Stinson Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
14
Baker Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
15
Half Moon Bay
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
16
Carmel River State Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
17
Moonstone Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
18
Grover Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
19
Oceano Dunes
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
20
Jalama Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
21
Rincon Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
22
Silver Strand Beach Ventura
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
23
Ventura Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
24
La Conchita Beach
Central California · United States · Pacific Ocean
Cool — shorty wetsuit recommended
16°C
September average
25
Revere Beach
Massachusetts · United States · Atlantic Ocean
Mild — fine for a swim, cool at first
18°C
September average

Coldest sea in September elsewhere

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United States in September — frequently asked questions

Where is the sea coldest in United States in September?: East Beach Santa Barbara in United States has the coldest sea in United States in September, averaging about 16.0 °C. Butterfly Beach (16.0 °C) and Refugio State Beach are the next coolest.
How many beaches in United States are warm enough to swim in September?: None of the top 25 ranked beaches in United States reach 22 °C in September, so a wetsuit is recommended for anything longer than a quick dip.
How are these September sea temperatures calculated?: Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.

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