Current sea water temperature:
+41.7°F
| Minimum sea water temperature in December: | 53.6°F |
| Maximum sea water temperature in December: | 41.5°F |
| Average sea water temperature in December: | 47.6°F |
| more information | |
14 days
forecast
forecast
| Fire Island |
monthly
weather
weather
| Fire Island |
Sea water temperature for the last 10 days:
| December 29 | 41.7°F | December 24 | 43.7°F |
| December 28 | 42.8°F | December 23 | 43.7°F |
| December 27 | 43.7°F | December 22 | 44.2°F |
| December 26 | 43.9°F | December 21 | 43.9°F |
| December 25 | 44.1°F | December 20 | 43.3°F |
Monthly sea water temperature, °F
When is the warmest sea in Fire Island?
Based on the data about daily sea water temperature for the last three years the warmest sea in Fire Island was noticed in July, August and September.
Monthly Sea Temperatures in Fire Island, °F
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 75.7°F. The highest and lowest sea temperatures during the month were 78.8°F and 71.6°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 73.8°F. The highest and lowest sea temperatures during the month were 78.4°F and 69.6°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 70.4°F. The highest and lowest sea temperatures during the month were 72.1°F and 68.4°F.
current
weather
weather
| Fire Island |
weather in
January
January
| Fire Island |
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: 12:00
December 29, monday
1500
48°F
E
18 mph
18 mph
1800
41°F
E
21 mph
21 mph
2100
34°F
E
21 mph
21 mph
December 30, tuesday
0000
30°F
E
21 mph
21 mph
0300
28°F
E
21 mph
21 mph
0600
28°F
E
20 mph
20 mph
0900
30°F
E
19 mph
19 mph
1200
30°F
E
20 mph
20 mph
