Jacksonville Beach — Sea temperature now
Long Duval-County family beach.
Very warm water with a light chop and a light breeze — great swimming conditions.
Location
Jacksonville Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Jacksonville Beach
The sea in Jacksonville Beach peaks in July, when the water averages around 29°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 22°C, when cold-water swimmers dominate the coast.
Jacksonville Beach sea temperature history
Long-term climatology for Jacksonville Beach shows an annual mean sea temperature of 26°C, ranging from 22°C in winter to 29°C at the summer peak.
The seasonal swing is roughly 7°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 Jacksonville Beach, 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.
Jacksonville Beach sea temperature: frequently asked questions
What is the warmest month to swim in Jacksonville Beach?
July is the warmest month in Jacksonville Beach, when the sea averages about 29°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Jacksonville Beach?
The coldest month in Jacksonville Beach is typically January, when the water averages around 22°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Jacksonville Beach without a wetsuit?
The main swimming season in Jacksonville Beach runs from January – December — about 12 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 Jacksonville Beach?
Jacksonville Beach stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Jacksonville Beach?
The long-term annual mean sea temperature in Jacksonville Beach is about 26°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Jacksonville Beach?
The live reading at the top of this page shows the current sea temperature in Jacksonville Beach, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 22°C | Warm |
| Feb | 22°C | Warm |
| Mar | 23°C | Warm |
| Apr | 25°C | Warm |
| May | 27°C | Hot |
| Jun | 28°C | Hot |
| Jul ⭐ | 29°C | Hot |
| Aug | 29°C | Hot |
| Sep | 29°C | Hot |
| Oct | 28°C | Hot |
| Nov | 25°C | Warm |
| Dec | 23°C | Warm |