Boston weather in August 2025

Expect 81°F daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Boston in August. Check more long-term weather averages for Boston in August before you book your next holiday to Massachusetts in 2025/2026.

  • 81°F maximum daytime temperature in August in Boston81
    81°F max day temperature
  • 9 hours of sunshine per day
  • 10 days with some rainfall in August in Boston10
    10 days with some rainfall
  • 61°F minimum night-time temperature in August in Boston61
    61°F min night temperature
  • 14 hours of daylight per day in August in Boston14
    14 hours of daylight per day
  • Low heat & humidity in August in BostonL
    Low heat & humidity
  • 3.3 inches monthly rainfall in August in Boston3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Boston8
    8 (Very High) UV index
  • 64°F sea temperature in August in Boston64
    64°F sea temperature

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The August 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 hot is it in Boston in August?

Daytime temperatures usually reach 81°F in Boston in August with low heat and humidity, falling to 61°F at night.

How sunny is it in Boston in August?

There are normally 9 hours of bright sunshine each day in Boston in August - that's 63% of daylight hours.

How warm is the sea around Boston in August?

The average sea temperature around Boston in August is 64°F.

Does it rain in Boston in August?

There are usually 10 days with some rain in Boston in August and the average monthly rainfall is 3.3 inches.

What is the chance of a hurricane in Boston in August?

On average less than 1 day in August in Boston is likely to be affected by the passage of one or more tropical storms.

Boston August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:37 19:03
Saturday, 16th August 2025 04:53 18:43
Sunday, 31st August 2025 05:09 18:19

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