Massachusetts weather in May 2025

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

  • 20°C maximum daytime temperature in May in Massachusetts (Boston)20
    20°C max day temperature
  • 8 hours of sunshine per day
  • 11 days with some rainfall in May in Massachusetts (Boston)11
    11 days with some rainfall
  • 9°C minimum night-time temperature in May in Massachusetts (Boston)9
    9°C min night temperature
  • 15 hours of daylight per day in May in Massachusetts (Boston)15
    15 hours of daylight per day
  • No heat & humidity in May in Massachusetts (Boston)0
    No heat & humidity
  • 85 mm monthly rainfall in May in Massachusetts (Boston)85
    85 mm of monthly rainfall
  • UV (maximum) index 7 (High) in May in Massachusetts (Boston)7
    7 (High) UV index
  • 9°C sea temperature in May in Massachusetts (Boston)9
    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.

Top Massachusetts destinations

Below are average maximum temperatures at popular countries, regions and places in Massachusetts in May. Select a holiday destination to see more weather parameters.

All Massachusetts destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Massachusetts in May?

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

How sunny is it in Massachusetts in May?

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

Is the sea cold around Massachusetts in May?

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

Does it rain in Massachusetts in May?

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

Massachusetts May sunrise & sunset times

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

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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