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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.
- 2020°C max day temperature
- 8 hours of sunshine per day
- 1111 days with some rainfall
- 99°C min night temperature
- 1515 hours of daylight per day
- 0No heat & humidity
- 8585 mm of monthly rainfall
- 77 (High) UV index
- 99°C sea temperature
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Recommended for Boston
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)
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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