Grand Isle Weather: December
 |
Average Day Temperature: | 63.8°F |
|
Average Night Temperature: | 61.5°F |
|
Sea Water Temperature: | 67.7°F |
|
Number of Sunny Days: | 10 days |
| Sunshine Hours: | 10.3 - 10.4 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.9 in | |
| detailed information | ||
forecast
| Grand Isle |
Temperature
| Grand Isle |
Air Temperature in December, °F
The highest day temperature in December 2025 was 70°F. The lowest night temperature was 44°F. The average values for day and night temperatures during December were 60.4°F и 60.3°F respectivly.
Grand Isle Water Sea Temperature in December, °F
The average sea surface temperature in December 2025 for Grand Isle was 67.6°F. The maximum and minimum values were 62.6°F and 73.0°F respectively.
You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in December, in
Precipitation total in December for Grand Isle is 0.9 in. It makes december one of the least rainy months of the year.
The average wind speed in December is 11.8 mph.
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 December is 5.8 hours.
Grand Isle on the Weather Map
| Chicago |  |
+42 |
| Hawaii |  |
+80 |
| Honolulu | |
+80 |
| Houston | |
+84 |
| Las Vegas |  |
+54 |
| Los Angeles | |
+64 |
| Maui | |
+76 |
| Miami | |
+84 |
| Miami Beach | |
+84 |
| New York | |
+54 |
| San Diego | |
+66 |
| San Francisco | |
+54 |
| Sarasota | |
+86 |
| Tampa | |
+88 |
| Washington | |
+54 |
| 1500 |  |
68°F | NW 18 mph |
| 1800 |  |
70°F | N 17 mph |
| 2100 | |
72°F | N 16 mph |
| 0000 | |
70°F | N 16 mph |
| 0300 | |
70°F | N 16 mph |
| 0600 | |
70°F | NE 14 mph |
| 0900 | |
70°F | NE 12 mph |
| 1200 | |
70°F | NE 11 mph |