Boston weather in August 2025

Expect 27°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in Boston in August based on long-term weather averages. There is usually 10 days with some rainfall and 85 mm of average monthly rainfall in August.

  • 27°C maximum daytime temperature in August in Boston27
    27°C max day temperature
  • 9 hours of sunshine per day
  • 10 days with some rainfall in August in Boston10
    10 days with some rainfall
  • 16°C minimum night-time temperature in August in Boston16
    16°C 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
  • 85 mm monthly rainfall in August in Boston85
    85 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Boston8
    8 (Very High) UV index
  • 18°C sea temperature in August in Boston18
    18°C 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Boston in August?

Daytime temperatures usually reach 27°C in Boston in August with low heat and humidity, falling to 16°C 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 18°C.

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 85mm.

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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