Measurements:
°C
°F
CURRENT WEATHER
10:30
Fire Island
64°F
SW 8 mph
Feels like: 64°F
Precip: 3%
World Resorts USA Fire Island Weather

7 Day Weather Forecast

09.15
tue
DAY
72°F
W 6 mph
precip
1%
NIGHT
64°F
NW 5 mph
precip
6%
09.16
wed
DAY
76°F
NE 6 mph
precip
6%
NIGHT
70°F
NE 7 mph
precip
7%
09.17
thu
DAY
78°F
NE 11 mph
precip
3%
NIGHT
76°F
NE 9 mph
precip
22%
09.18
fri
DAY
78°F
SW 9 mph
precip
9%
NIGHT
72°F
SW 9 mph
precip
16%
09.19
sat
DAY
76°F
NW 9 mph
precip
11%
NIGHT
74°F
N 14 mph
precip
24%
09.20
sun
DAY
86°F
E 9 mph
precip
12%
NIGHT
72°F
SW 8 mph
precip
6%
09.21
mon
DAY
74°F
W 7 mph
precip
11%
NIGHT
68°F
W 11 mph
precip
22%

Fire Island Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Fire Island was 23.3°F. The maximum and minimum values were 22.5°F and 24.2°F respectively.

Fire Island on the Weather Map

Best Time to Visit Fire Island
The most sunny months:
November 16 days
September 15 days
July 14 days
The most warm months:
July 85.5 °F
August 83.6 °F
June 78.3 °F
Warmest sea temperature:
July 79.4 °F
August 79.0 °F
September 74.6 °F
The most cold months:
January 36.0 °F
February 36.9 °F
December 41.5 °F
The most rainy months:
December 3 days
April 3 days
August 3 days
The most windy months:
March 11 mph
January 11 mph
November 11 mph
more details