Weather in Hilton Head Island: December
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Average day temperature: | 58.8°F |
| Average night temperature: | 51.1°F | |
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Sea water temperature: | 57.5°F |
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Number of sunny days: | 15 days |
| Day length: | 10.0 - 10.2 hours | |
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Number of rainy days: | 1 day |
| Precipitation totals: | 0.7 in. | |
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forecast
| Hilton Head Island |
temperature
| Hilton Head Island |
Air temperature in December, °F
The highest day temperature during December of 2025 was 72°F. At the same time the lowest night temperature was 31°F. Daily and nightly averages during December were 58.6°F and 48.5°F.
Sea water temperature in Hilton Head Island in December, °F
The average sea water temperature in December of 2025 was 56.2°F. The highest and lowest sea temperatures during the month were 61.0°F and 52.3°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Hilton Head Island in December is 0.7 in. Other months of the year show relatively similar values.
The average wind speed value in December is 8.1 mph It makes December most windy month 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: 5.9.
Best time for vacation in Hilton Head Island
Hilton Head Island on a weather map
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