Current sea water temperature:
+43.3°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: | 47.9°F |
| more information | |
14 days
forecast
forecast
| Fire Island |
monthly
weather
weather
| Fire Island |
Sea water temperature for the last 10 days:
| December 16 | 43.3°F | December 11 | 46.6°F |
| December 15 | 44.4°F | December 10 | 46.4°F |
| December 14 | 45.5°F | December 9 | 46.6°F |
| December 13 | 45.3°F | December 8 | 46.8°F |
| December 12 | 46.8°F | December 7 | 47.1°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
December
December
| 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: 08:50
December 16, tuesday
0900
21°F
E
7 mph
7 mph
1200
28°F
E
7 mph
7 mph
1500
32°F
E
6 mph
6 mph
1800
30°F
E
8 mph
8 mph
2100
30°F
NE
11 mph
11 mph
December 17, wednesday
0000
30°F
NE
12 mph
12 mph
0300
32°F
NE
13 mph
13 mph
0600
36°F
NE
13 mph
13 mph
