Casey Key Beach Water Temperature
Sea-surface temperature at Casey Key Beach, Florida · times in EDT
Updated 7:03 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 |
|---|---|---|---|
| Fri, Aug 28 | 90° / 77° | 8 | 11% |
| Sat, Aug 29 | 91° / 75° | 8 | 59% |
| Sun, Aug 30 | 96° / 72° | 8 | 79% |
| Mon, Aug 31 | 94° / 74° | 8 | 80% |
| Tue, Sep 1 | 95° / 78° | 7 | 78% |
| Wed, Sep 2 | 94° / 76° | 8 | 72% |
| Thu, Sep 3 | 89° / 76° | 6 | 64% |
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 89°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 right on the August average of 89°F for this 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.
Frequently asked questions
How warm is the water at Casey Key Beach right now?
The sea-surface temperature is about 89°F. That is right on the August average of 89°F for this beach.
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.