Weather in St. Simons Island: December
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Average day temperature: | 62.5°F |
| Average night temperature: | 53.3°F | |
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Sea water temperature: | 59.3°F |
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Number of sunny days: | 13 days |
| Day length: | 10.1 - 10.3 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.7 in. | |
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forecast
| St. Simons Island |
temperature
| St. Simons Island |
Air temperature in December, °F
The highest day temperature during December of 2025 was 74°F. At the same time the lowest night temperature was 32°F. Daily and nightly averages during December were 61.4°F and 49.9°F.
Sea water temperature in St. Simons Island in December, °F
The average sea water temperature in December of 2025 was 58.1°F. The highest and lowest sea temperatures during the month were 64.0°F and 53.1°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in St. Simons Island in December is 0.7 in. Other months of the year show relatively similar values.
The average wind speed value in December is 6.8 mph It makes December one of the most windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 6.0.
Best time for vacation in St. Simons Island
St. Simons Island on a weather map
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