Massachusetts weather in September 2025

Expect daytime maximum temperatures of 23°C in Massachusetts, USA in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 82 mm of rainfall in the month.

  • 23°C maximum daytime temperature in September in Massachusetts (Boston)23
    23°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Massachusetts (Boston)8
    8 days with some rainfall
  • 12°C minimum night-time temperature in September in Massachusetts (Boston)12
    12°C min night temperature
  • 12 hours of daylight per day in September in Massachusetts (Boston)12
    12 hours of daylight per day
  • No heat & humidity in September in Massachusetts (Boston)0
    No heat & humidity
  • 82 mm monthly rainfall in September in Massachusetts (Boston)82
    82 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Massachusetts (Boston)6
    6 (High) UV index
  • 16°C sea temperature in September in Massachusetts (Boston)16
    16°C sea temperature

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The September 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 September. Select a holiday destination to see more weather parameters.

All Massachusetts destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Massachusetts in September?

Daytime temperatures usually reach 23°C in Boston, Massachusetts in September, falling to 12°C at night.

How sunny is it in Massachusetts in September?

There are normally 8 hours of bright sunshine each day in Boston, Massachusetts in September - that's 61% of daylight hours.

How warm is the sea around Massachusetts in September?

The average sea temperature around Boston, Massachusetts in September is 16°C.

Does it rain in Massachusetts in September?

There are usually 8 days with some rain in Boston, Massachusetts in September and the average monthly rainfall is 82mm.

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

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

Massachusetts September sunrise & sunset times

Browse the sunrise and sunset times for Massachusetts in September 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
Monday, 1st September 2025 05:10 18:18
Monday, 15th September 2025 05:24 17:53
Tuesday, 30th September 2025 05:41 17:27

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