Weather in Dewey Beach: December
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Average day temperature: | 45.6°F |
| Average night temperature: | 41.6°F | |
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Sea water temperature: | 47.6°F |
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Number of sunny days: | 13 days |
| Day length: | 9.4 - 9.7 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.3 in. | |
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forecast
| Dewey Beach |
temperature
| Dewey Beach |
Air temperature in December, °F
The highest day temperature during December of 2025 was 53°F. At the same time the lowest night temperature was 22°F. Daily and nightly averages during December were 41.6°F and 36.8°F.
Sea water temperature in Dewey Beach in December, °F
The average sea water temperature in December of 2025 was 44.2°F. The highest and lowest sea temperatures during the month were 50.5°F and 41.2°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Dewey Beach in December is 1.3 in. Other months of the year show relatively similar values.
The average wind speed value in December is 12.4 mph
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: 5.6.
Best time for vacation in Dewey Beach
Dewey Beach on a weather map
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