Grand Isle Weather: August
 |
Average Day Temperature: | 89.8°F |
|
Average Night Temperature: | 87.1°F |
|
Sea Water Temperature: | 92.2°F |
|
Number of Sunny Days: | 10 days |
| Sunshine Hours: | 12.8 - 13.5 hours | |
|
Number of Rainy Days: | 4 days |
| Precipitation Totals: | 2.4 in | |
| detailed information | ||
forecast
| Grand Isle |
Temperature
| Grand Isle |
Air Temperature in August, °F
The highest day temperature in August 2025 was 92°F. The lowest night temperature was 85°F. The average values for day and night temperatures during August were 89.0°F и 87.1°F respectivly.
Grand Isle Water Sea Temperature in August, °F
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.
Most of the days in August are cloudy but you can also expect sunny or gloomy days.
Precipitation Totals in August, in
Precipitation total in August for Grand Isle is 2.4 in. It makes august the most rainy month of the year.
The average wind speed in August is 9.2 mph. It makes August one of the most windless months of the year for Grand Isle.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Grand Isle in August is 7.5 hours.
Grand Isle on the Weather Map
| 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 |
| 1500 |  |
90°F | N 9 mph |
| 1800 | |
90°F | N 11 mph |
| 2100 |  |
90°F | S 14 mph |
| 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 |