Massachusetts weather in August 2025

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

  • 81°F maximum daytime temperature in August in Massachusetts (Boston)81
    81°F max day temperature
  • 9 hours of sunshine per day
  • 10 days with some rainfall in August in Massachusetts (Boston)10
    10 days with some rainfall
  • 61°F minimum night-time temperature in August in Massachusetts (Boston)61
    61°F min night temperature
  • 14 hours of daylight per day in August in Massachusetts (Boston)14
    14 hours of daylight per day
  • Low heat & humidity in August in Massachusetts (Boston)L
    Low heat & humidity
  • 3.3 inches monthly rainfall in August in Massachusetts (Boston)3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Massachusetts (Boston)8
    8 (Very High) UV index
  • 64°F sea temperature in August in Massachusetts (Boston)64
    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.

Top Massachusetts destinations

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

All Massachusetts destinations

Metric (°C)  |  Imperial (°F)

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How hot is it in Massachusetts in August?

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

How sunny is it in Massachusetts in August?

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

How warm is the sea around Massachusetts in August?

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

Does it rain in Massachusetts in August?

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

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

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

Massachusetts August sunrise & sunset times

Browse the sunrise and sunset times for Massachusetts in August 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
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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