St. Augustine Beach Water Temperature
Sea-surface temperature at St. Augustine Beach, Florida · times in EDT
Updated 3:59 AM EDT
How it compares today
Water temperature through the year
Monthly normals computed from 2023–2025 daily sea-surface temperature history.
Nearby water right now
7-day outlook
| Day | Air high / low | Max UV | Rain |
|---|---|---|---|
| Tue, Oct 13 | 80° / 68° | 7 | 0% |
| Wed, Oct 14 | 80° / 68° | 6 | 9% |
| Thu, Oct 15 | 86° / 71° | 6 | 9% |
| Fri, Oct 16 | 91° / 70° | 6 | 12% |
| Sat, Oct 17 | 78° / 74° | 2 | 39% |
| Sun, Oct 18 | 75° / 72° | 1 | 37% |
| Mon, Oct 19 | 80° / 75° | 4 | 36% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is St. Augustine Beach warm enough to swim?
At 81°F, the water at St. Augustine Beach is warm — great for swimming. Most swimmers are comfortable without a wetsuit above 72°F; below 62°F, cold-water shock becomes a real risk for unprotected swimmers.
That is 3° above the October average of 78°F here.
The water averages above 70°F in April, May, June, July, August, September, October and November — 8 months of the year — peaking around 85°F in July and dropping to about 61°F in January.
Frequently asked questions
How warm is the water at St. Augustine Beach right now?
The sea-surface temperature is about 81°F. That is 3° above the October average of 78°F here.
When is the water warm enough to swim at St. Augustine Beach?
The water averages above 70°F in April, May, June, July, August, September, October and November — 8 months of the year — peaking around 85°F in July and dropping to about 61°F in January.
What is the warmest the water gets at St. Augustine Beach?
Around 85°F in July, based on 2023–2025 records. The coolest month is January at roughly 61°F.