Boston weather in May 2025

Expect daytime maximum temperatures of 20°C in Boston in May based on long-term weather averages. There are 8 hours of sunshine per day on average with 11 days with some rainfall and typically 85 mm of rainfall in the month.

  • 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

More about Boston

Boston by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Massachusetts

TUI discount code: up to £300 off 2025/2026 holidays

  • Save up to £300 on package holidays in 2025/2026
  • Book in TUI sale. Discount varies by spend. T&Cs apply
  • Travel between 1st May 2025 & 31st Oct 2026 (inclusive)
Show discount codeShow discount code ******ALE
Redeem TUI discount code >>

Expires at 10:00 on Friday 28th Feb 2025 · View all TUI offers

TUITUI deal finder

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^