Boston weather in January 2026

Expect daytime maximum temperatures of 34°F in Boston, Massachusetts in January based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall and typically 3.7 inches of rainfall in the month, which might fall as snow.

  • 34°F maximum daytime temperature in January in Boston34
    34°F max day temperature
  • 5 hours of sunshine per day
  • 11 days with some rainfall in January in Boston11
    11 days with some rainfall
  • 18°F minimum night-time temperature in January in Boston18
    18°F 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
  • 3.7 inches monthly rainfall in January in Boston3.7
    3.7 inches of monthly rainfall
  • UV (maximum) index 1 (Low) in January in Boston1
    1 (Low) UV index
  • 39°F sea temperature in January in Boston39
    39°F sea temperature

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The January weather guide for Massachusetts (Boston) 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.

Metric (°C)  |  Imperial (°F)

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More about the USA

How cold is it in Boston in January?

Daytime temperatures usually reach 34°F in Boston in January, falling to 18°F 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.

How warm is the sea around Boston in January?

The average sea temperature around Boston in January is 39°F.

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 3.7 inches. Rain may fall as snow in this month.

Boston January sunrise & sunset times

Browse the sunrise and sunset times for Boston in January 2026. Select a month to view Boston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st January 2026 07:13 16:22
Friday, 16th January 2026 07:10 16:38
Saturday, 31st January 2026 06:59 16:57

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