Casey Key Beach Water Temperature
Sea-surface temperature at Casey Key Beach, Florida · times in EDT
Updated 4:00 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 | 83° / 66° | 7 | 0% |
| Wed, Oct 14 | 85° / 70° | 7 | 6% |
| Thu, Oct 15 | 90° / 72° | 7 | 39% |
| Fri, Oct 16 | 91° / 75° | 6 | 47% |
| Sat, Oct 17 | 77° / 72° | 1 | 30% |
| Sun, Oct 18 | 85° / 72° | 6 | 25% |
| Mon, Oct 19 | 89° / 72° | 6 | 26% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Casey Key Beach warm enough to swim?
At 84°F, the water at Casey Key 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 81°F here.
The water averages above 70°F in March, April, May, June, July, August, September, October and November — 9 months of the year — peaking around 89°F in July and dropping to about 65°F in January.
Frequently asked questions
How warm is the water at Casey Key Beach right now?
The sea-surface temperature is about 84°F. That is 3° above the October average of 81°F here.
When is the water warm enough to swim at Casey Key Beach?
The water averages above 70°F in March, April, May, June, July, August, September, October and November — 9 months of the year — peaking around 89°F in July and dropping to about 65°F in January.
What is the warmest the water gets at Casey Key Beach?
Around 89°F in July, based on 2023–2025 records. The coolest month is January at roughly 65°F.