Current sea water temperature:
+64.0°F
| Minimum sea water temperature in December: | 72.7°F |
| Maximum sea water temperature in December: | 56.8°F |
| Average sea water temperature in December: | 66.0°F |
| more information | |
14 days
forecast
forecast
| Grand Isle |
monthly
weather
weather
| Grand Isle |
Sea water temperature for the last 10 days:
| December 14 | 64.0°F | December 9 | 66.2°F |
| December 13 | 62.6°F | December 8 | 66.2°F |
| December 12 | 62.4°F | December 7 | 65.5°F |
| December 11 | 63.5°F | December 6 | 65.5°F |
| December 10 | 64.8°F | December 5 | 65.5°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:
2025
2024
2023
The average sea water temperature in August of 2025 was 87.9°F. The highest and lowest sea temperatures during the month were 90.1°F and 86.0°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 88.3°F. The highest and lowest sea temperatures during the month were 90.5°F and 86.2°F.
Sea water temperature in June, °F
Show year:
2025
2024
2023
The average sea water temperature in June of 2025 was 86.2°F. The highest and lowest sea temperatures during the month were 89.1°F and 83.5°F.
current
weather
weather
| Grand Isle |
weather in
December
December
| 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: 00:54
December 15, monday
0300
43°F
SW
21 mph
21 mph
0600
43°F
SW
17 mph
17 mph
0900
43°F
SW
15 mph
15 mph
1200
45°F
SW
14 mph
14 mph
1500
46°F
SW
14 mph
14 mph
1800
46°F
SW
12 mph
12 mph
2100
48°F
SW
10 mph
10 mph
December 16, tuesday
0000
50°F
SW
10 mph
10 mph
