Current sea water temperature:
+81.9°F
| Minimum sea water temperature in May: | 85.6°F |
| Maximum sea water temperature in May: | 73.2°F |
| Average sea water temperature in May: | 79.7°F |
| more information | |
14 days
forecast
forecast
| Grand Isle |
monthly
weather
weather
| Grand Isle |
Sea water temperature for the last 10 days:
| May 23 | 81.9°F | May 18 | 80.8°F |
| May 22 | 81.9°F | May 17 | 81.0°F |
| May 21 | 81.3°F | May 16 | 80.1°F |
| May 20 | 81.1°F | May 15 | 79.5°F |
| May 19 | 82.0°F | May 14 | 77.0°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
May
May
| 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: 17:15
May 23, saturday
1800
75°F
NW
12 mph
12 mph
2100
77°F
N
11 mph
11 mph
May 24, sunday
0000
79°F
N
9 mph
9 mph
0300
79°F
N
10 mph
10 mph
0600
81°F
NW
12 mph
12 mph
0900
81°F
NW
14 mph
14 mph
1200
81°F
NW
12 mph
12 mph
1500
81°F
N
9 mph
9 mph
