Key West Beach Water Temperature
Sea-surface temperature at Key West 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 | 89° / 78° | 7 | 40% |
| Wed, Oct 14 | 88° / 80° | 7 | 40% |
| Thu, Oct 15 | 85° / 83° | 7 | 47% |
| Fri, Oct 16 | 85° / 83° | 7 | 55% |
| Sat, Oct 17 | 84° / 83° | 6 | 70% |
| Sun, Oct 18 | 83° / 79° | 3 | 75% |
| Mon, Oct 19 | 84° / 83° | 6 | 75% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Key West Beach warm enough to swim?
At 86°F, the water at Key West 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 2° above the October average of 84°F here.
The water stays above 70°F essentially year round, ranging from about 75°F to 89°F.
Frequently asked questions
How warm is the water at Key West Beach right now?
The sea-surface temperature is about 86°F. That is 2° above the October average of 84°F here.
When is the water warm enough to swim at Key West Beach?
The water stays above 70°F essentially year round, ranging from about 75°F to 89°F.
What is the warmest the water gets at Key West Beach?
Around 89°F in August, based on 2023–2025 records. The coolest month is January at roughly 75°F.