Weather in Boston: January
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Average day temperature: | 33.2°F |
| Average night temperature: | 27.3°F | |
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Sea water temperature: | 40.6°F |
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Number of sunny days: | 13 days |
| Day length: | 9.1 - 10.0 hours | |
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Number of days with precipitation: | 3 days |
| Precipitation totals: | 2.5 in. | |
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forecast
| Boston |
temperature
| Boston |
Air temperature in January, °F
The highest day temperature during January of 2026 was 54°F. At the same time the lowest night temperature was -3°F. Daily and nightly averages during January were 31.2°F and 22.6°F.
Sea water temperature in Boston in January, °F
The average sea water temperature in January of 2026 was 37.9°F. The highest and lowest sea temperatures during the month were 40.8°F and 33.1°F.
Number of sunny, partly cloudy and cloudy days in January is almost equal.
Precipitation total in January, in.
Precipitation total value in Boston in January is 2.3 in. Other months of the year show relatively similar values.
The average wind speed value in January is 9.9 mph It makes January 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 January is: 5.0.
Best time for vacation in Boston
Boston on a weather map
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