Boston weather in May 2025

Expect 20°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Boston in May. Check more long-term weather averages for Boston in May before you book your next holiday to Massachusetts in 2025/2026.

  • 20°C maximum daytime temperature in May in Boston20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Boston11
    11 days with some rainfall
  • 9°C minimum night-time temperature in May in Boston9
    9°C min night temperature
  • 15 hours of daylight per day in May in Boston15
    15 hours of daylight per day
  • No heat & humidity in May in Boston0
    No heat & humidity
  • 85 mm monthly rainfall in May in Boston85
    85 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Boston7
    7 (High) UV index
  • 9°C sea temperature in May in Boston9
    9°C sea temperature

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The May 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 / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Boston in May?

Daytime temperatures usually reach 20°C in Boston in May, falling to 9°C at night.

How sunny is it in Boston in May?

There are normally 8 hours of bright sunshine each day in Boston in May - that's 57% of daylight hours.

Is the sea cold around Boston in May?

The average sea temperature around Boston in May is 9°C.

Does it rain in Boston in May?

There are usually 11 days with some rain in Boston in May and the average monthly rainfall is 85mm.

Boston May sunrise & sunset times

Browse the sunrise and sunset times for Boston in May 2025. Select a month to view Boston sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 04:39 18:44
Friday, 16th May 2025 04:21 19:00
Saturday, 31st May 2025 04:10 19:14

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