Current Sea Water Temperature:
+80.0°F
| Maximum Sea Water Temperature in May: | 89.6°F |
| Minimum Sea Water Temperature in May: | 75.8°F |
| Average water temperature in May: | 83.0°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 14 | 80.0°F | May 09 | 81.4°F |
| May 13 | 79.2°F | May 08 | 79.8°F |
| May 12 | 79.4°F | May 07 | 78.8°F |
| May 11 | 79.8°F | May 06 | 77.2°F |
| May 10 | 80.2°F | May 05 | 77.2°F |
When is the Warmest Sea for Grand Isle?
According to our data for the last three years for Grand Isle the highest average sea water temperature was in August, July and June.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Grand Isle was 92.2°F. The maximum and minimum values were 90.0°F and 94.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Grand Isle was 92.5°F. The maximum and minimum values were 90.2°F and 95.0°F respectively.
Sea Water Temperature in June
The average sea surface temperature in June 2025 for Grand Isle was 90.3°F. The maximum and minimum values were 87.2°F and 93.4°F respectively.
USA Resorts:
NAME
F°
| Boston |  |
+62 |
| Chicago |  |
+56 |
| Hawaii |  |
+76 |
| Honolulu | |
+76 |
| Houston | |
+94 |
| Las Vegas | |
+88 |
| Los Angeles | |
+66 |
| Maui | |
+70 |
| Miami | |
+94 |
| Miami Beach | |
+90 |
| New York | |
+68 |
| San Diego | |
+66 |
| San Francisco | |
+62 |
| Sarasota | |
+94 |
| Tampa | |
+94 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Isle
Local time: 12:07
14 may, thursday
| 1500 |  |
80°F | N 8 mph |
| 1800 | |
80°F | NE 11 mph |
| 2100 |  |
80°F | NE 9 mph |
15 may, friday
| 0000 | |
80°F | NE 7 mph |
| 0300 | |
78°F | N 7 mph |
| 0600 | |
78°F | N 6 mph |
| 0900 |  |
78°F | NW 8 mph |
| 1200 | |
78°F | NW 11 mph |