Current Sea Water Temperature:
+91.0°F
| Maximum Sea Water Temperature in July: | 95.8°F |
| Minimum Sea Water Temperature in July: | 85.6°F |
| Average water temperature in July: | 91.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 15 | 91.0°F | July 10 | 91.8°F |
| July 14 | 91.0°F | July 09 | 91.8°F |
| July 13 | 91.8°F | July 08 | 91.4°F |
| July 12 | 91.8°F | July 07 | 91.8°F |
| July 11 | 92.4°F | July 06 | 93.4°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 2026 for Grand Isle was 92.4°F. The maximum and minimum values were 91.0°F and 94.0°F respectively.
Sea Water Temperature in June
The average sea surface temperature in June 2026 for Grand Isle was 89.4°F. The maximum and minimum values were 85.6°F and 93.0°F respectively.
USA Resorts:
NAME
F°
| Boston |  |
+92 |
| Chicago | |
+86 |
| Hawaii |  |
+80 |
| Houston |  |
+80 |
| Las Vegas | |
+120 |
| Los Angeles | |
+106 |
| Maui |  |
+76 |
| Miami | |
+96 |
| Myrtle Beach | |
+96 |
| New York | |
+110 |
| San Diego | |
+96 |
| San Francisco | |
+76 |
| Santa Monica | |
+84 |
| Sarasota | |
+102 |
| Tampa | |
+100 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Grand Isle
Local time: 14:12
15 jul, wednesday
| 1500 |  |
90°F | N 9 mph |
| 1800 | |
90°F | N 11 mph |
| 2100 |  |
90°F | S 14 mph |
16 jul, thursday
| 0000 | |
90°F | W 4 mph |
| 0300 |  |
86°F | N 9 mph |
| 0600 | |
88°F | N 10 mph |
| 0900 |  |
88°F | N 5 mph |
| 1200 | |
88°F | NW 7 mph |