Fire Island Beach Water Temperature
Sea-surface temperature at Fire Island Beach, New York · 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 | 64° / 61° | 5 | 7% |
| Wed, Oct 14 | 72° / 64° | 5 | 11% |
| Thu, Oct 15 | 65° / 57° | 5 | 5% |
| Fri, Oct 16 | 68° / 57° | 3 | 68% |
| Sat, Oct 17 | 56° / 42° | 5 | 15% |
| Sun, Oct 18 | 57° / 41° | 4 | 1% |
| Mon, Oct 19 | 60° / 51° | 4 | 2% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Fire Island Beach warm enough to swim?
At 65°F, the water at Fire Island Beach is cool but swimmable. 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 October average of 65°F for this beach.
The water averages above 70°F in July, August and September — 3 months of the year — peaking around 73°F in July and dropping to about 41°F in February.
Frequently asked questions
How warm is the water at Fire Island Beach right now?
The sea-surface temperature is about 65°F. That is right on the October average of 65°F for this beach.
When is the water warm enough to swim at Fire Island Beach?
The water averages above 70°F in July, August and September — 3 months of the year — peaking around 73°F in July and dropping to about 41°F in February.
What is the warmest the water gets at Fire Island Beach?
Around 73°F in July, based on 2023–2025 records. The coolest month is February at roughly 41°F.