Current sea water temperature:
+61.5°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: | 65.9°F |
| more information | |
14 days
forecast
forecast
| Grand Isle |
monthly
weather
weather
| Grand Isle |
Sea water temperature for the last 10 days:
| December 18 | 61.5°F | December 13 | 62.6°F |
| December 17 | 61.3°F | December 12 | 62.4°F |
| December 16 | 62.6°F | December 11 | 63.5°F |
| December 15 | 63.9°F | December 10 | 64.8°F |
| December 14 | 64.0°F | December 9 | 66.2°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: 20:00
December 18, thursday
2100
64°F
E
12 mph
12 mph
December 19, friday
0000
64°F
E
11 mph
11 mph
0300
64°F
SE
16 mph
16 mph
0600
64°F
S
17 mph
17 mph
0900
61°F
S
16 mph
16 mph
1200
61°F
S
14 mph
14 mph
1500
61°F
S
8 mph
8 mph
1800
61°F
SW
9 mph
9 mph
