Fire Island Beach Water Temperature
Sea-surface temperature at Fire Island Beach, New York · 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 | 75° / 74° | 7 | 13% |
| Sat, Aug 29 | 74° / 69° | 6 | 0% |
| Sun, Aug 30 | 80° / 69° | 7 | 25% |
| Mon, Aug 31 | 81° / 73° | 5 | 25% |
| Tue, Sep 1 | 75° / 69° | 2 | 43% |
| Wed, Sep 2 | 81° / 71° | 5 | 43% |
| Thu, Sep 3 | 85° / 71° | 7 | 39% |
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 74°F, the water at Fire Island Beach is comfortable. 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 August average of 72°F here.
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 74°F. That is 2° above the August average of 72°F here.
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.