Weather in Charlestown: January
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Average day temperature: | 36.5°F |
| Average night temperature: | 32.6°F | |
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Sea water temperature: | 42.9°F |
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Number of sunny days: | 11 days |
| Day length: | 9.2 - 10.0 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.2 in. | |
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forecast
| Charlestown |
temperature
| Charlestown |
Air temperature in January, °F
The highest day temperature during January of 2026 was 45°F. At the same time the lowest night temperature was 14°F. Daily and nightly averages during January were 32.8°F and 30.7°F.
Sea water temperature in Charlestown in January, °F
The average sea water temperature in January of 2026 was 40.0°F. The highest and lowest sea temperatures during the month were 42.6°F and 37.0°F.
Number of sunny, partly cloudy and cloudy days in January is almost equal.
Precipitation total in January, in.
Precipitation total value in Charlestown in January is 1.2 in. Other months of the year show relatively similar values.
The average wind speed value in January is 13.3 mph It makes January 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 January is: 5.2.
Best time for vacation in Charlestown
Charlestown on a weather map
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