Boston weather in January 2021

  • 1°C maximum daytime temperature in January in Boston1
    1°C max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in January in Boston11
    11 days with some rainfall
  • -8°C minimum night-time temperature in January in Boston-8
    -8°C min night temperature
  • 9 hours of daylight per day in January in Boston9
    9 hours of daylight per day
  • No heat & humidity in January in Boston0
    No heat & humidity
  • 93 mm monthly rainfall in January in Boston93
    93 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Boston1
    1 (Low) UV index
  • 4°C sea temperature in January in Boston4
    4°C sea temperature
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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The January weather guide for Boston, Massachusetts shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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How cold is it in Boston in January?

Daytime temperatures usually reach 1°C in Boston in January, falling to -8°C at night.

How sunny is it in Boston in January?

There are normally 5 hours of bright sunshine each day in Boston in January - that's 55% of daylight hours.

Is the sea cold around Boston in January?

The average sea temperature around Boston in January is 4°C.

Does it rain in Boston in January?

There are usually 11 days with some rain in Boston in January and the average monthly rainfall is 93mm.

Boston sunrise & sunset times for January 2021

Browse the sunrise & sunset times for Boston in January 2021. Select a month to view Boston sunrise & sunset times for the next twelve months.


Date Sunrise times Sunset times
Friday, 1st January 2021 07:13 16:23
Saturday, 16th January 2021 07:10 16:39
Sunday, 31st January 2021 06:59 16:57
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Metric (°C / mm)  |  Imperial (°F / inches)

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Where's warm in Massachusetts in January?

Below are average maximum temperatures at popular destinations in Massachusetts in January. Select a destination to see more weather parameters.

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