19.09
sat
sat
Day
68°F
SW 7 mph
Precip.
6%
6%
Night
63°F
NW 7 mph
Precip.
11%
11%
20.09
sun
sun
Day
66°F
NW 9 mph
Precip.
18%
18%
Night
68°F
NE 14 mph
Precip.
87%
87%
21.09
mon
mon
Day
61°F
SW 12 mph
Precip.
48%
48%
Night
63°F
SW 12 mph
Precip.
15%
15%
22.09
tue
tue
Day
57°F
SW 15 mph
Precip.
38%
38%
Night
54°F
SW 15 mph
Precip.
78%
78%
23.09
wed
wed
Day
59°F
SW 17 mph
Precip.
41%
41%
Night
61°F
SW 16 mph
Precip.
22%
22%
24.09
thu
thu
Day
61°F
SW 16 mph
Precip.
23%
23%
Night
57°F
SW 13 mph
Precip.
27%
27%
25.09
fri
fri
Day
64°F
SW 10 mph
Precip.
7%
7%
Night
59°F
SW 5 mph
Precip.
6%
6%
sea water
temperature
temperature
| Fire Island |
monthly
weather
weather
| Fire Island |
current
weather
weather
| Fire Island |
14 days
forecast
forecast
| Fire Island |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 73.6°F. The highest and lowest sea temperatures during the month were 75.6°F and 71.1°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 65.5°F. The highest and lowest sea temperatures during the month were 71.6°F and 61.0°F.
Air temperature in Fire Island, °F
Precipitation total in Fire Island, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Fire Island
Fire Island on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Fire Island
Local time: 05:19
September 19, saturday
0600
61°F
SW
11 mph
11 mph
0900
63°F
SW
11 mph
11 mph
1200
68°F
SW
7 mph
7 mph
1500
70°F
NW
7 mph
7 mph
1800
64°F
NW
9 mph
9 mph
2100
63°F
NW
7 mph
7 mph
September 20, sunday
0000
63°F
NW
7 mph
7 mph
0300
61°F
NW
6 mph
6 mph
