Current sea water temperature:
+78.1°F
| Minimum sea water temperature in August: | 82.8°F |
| Maximum sea water temperature in August: | 69.6°F |
| Average sea water temperature in August: | 76.3°F |
| more information | |
14 days
forecast
forecast
| Fire Island |
monthly
weather
weather
| Fire Island |
Sea water temperature for the last 10 days:
| August 15 | 78.1°F | August 10 | 78.6°F |
| August 14 | 79.5°F | August 9 | 77.9°F |
| August 13 | 80.1°F | August 8 | 78.4°F |
| August 12 | 79.2°F | August 7 | 76.3°F |
| August 11 | 79.7°F | August 6 | 77.4°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 74.5°F. The highest and lowest sea temperatures during the month were 81.5°F and 71.6°F.
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 77.6°F. The highest and lowest sea temperatures during the month were 80.1°F and 74.3°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
August
August
| 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: 18:28
August 15, saturday
2100
75°F
N
2 mph
2 mph
August 16, sunday
0000
73°F
NE
4 mph
4 mph
0300
72°F
E
3 mph
3 mph
0600
70°F
S
2 mph
2 mph
0900
77°F
N
2 mph
2 mph
1200
81°F
N
9 mph
9 mph
1500
79°F
N
12 mph
12 mph
1800
75°F
N
12 mph
12 mph
