Current sea water temperature:
+66.7°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 4 | 66.7°F | November 29 | 71.1°F |
| December 3 | 67.5°F | November 28 | 73.0°F |
| December 2 | 68.5°F | November 27 | 74.7°F |
| December 1 | 68.7°F | November 26 | 75.2°F |
| November 30 | 70.9°F | November 25 | 75.2°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: 21:03
December 05, friday
0000
63°F
SE
10 mph
10 mph
0300
59°F
S
14 mph
14 mph
0600
57°F
S
12 mph
12 mph
0900
54°F
S
14 mph
14 mph
1200
54°F
S
10 mph
10 mph
1500
57°F
S
12 mph
12 mph
1800
59°F
SW
12 mph
12 mph
2100
57°F
SW
11 mph
11 mph
