Current sea water temperature:
+85.8°F
| Minimum sea water temperature in September: | 88.9°F |
| Maximum sea water temperature in September: | 77.2°F |
| Average sea water temperature in September: | 84.9°F |
| more information | |
14 days
forecast
forecast
| Grand Isle |
monthly
weather
weather
| Grand Isle |
Sea water temperature for the last 10 days:
| September 22 | 85.8°F | September 17 | 87.6°F |
| September 21 | 86.2°F | September 16 | 88.0°F |
| September 20 | 85.5°F | September 15 | 88.0°F |
| September 19 | 85.8°F | September 14 | 87.4°F |
| September 18 | 85.8°F | September 13 | 86.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Grand Isle?
Based on the data about daily sea water temperature for the last three years the warmest sea in Grand Isle was noticed in August, July and June.
Monthly Sea Temperatures in Grand Isle, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 87.7°F. The highest and lowest sea temperatures during the month were 90.7°F and 84.4°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 87.4°F. The highest and lowest sea temperatures during the month were 89.6°F and 85.1°F.
Sea water temperature in June, °F
Show year:
2026
2025
2024
The average sea water temperature in June of 2026 was 85.5°F. The highest and lowest sea temperatures during the month were 88.7°F and 82.0°F.
current
weather
weather
| Grand Isle |
weather in
September
September
| Grand Isle |
Best time for vacation in Grand Isle
Grand Isle on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Grand Isle
Local time: 00:24
September 23, wednesday
0300
84°F
W
4 mph
4 mph
0600
82°F
S
10 mph
10 mph
0900
82°F
SW
9 mph
9 mph
1200
86°F
W
5 mph
5 mph
1500
88°F
W
14 mph
14 mph
1800
86°F
W
12 mph
12 mph
2100
84°F
W
7 mph
7 mph
September 24, thursday
0000
84°F
W
6 mph
6 mph
