Chatham weather in September 2025

Expect 70°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Chatham in September. Check more long-term weather averages for Chatham in September before you book your next holiday to Massachusetts in 2025/2026.

  • 70°F maximum daytime temperature in September in Chatham70
    70°F max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Chatham8
    8 days with some rainfall
  • 57°F minimum night-time temperature in September in Chatham57
    57°F min night temperature
  • 12 hours of daylight per day in September in Chatham12
    12 hours of daylight per day
  • No heat & humidity in September in Chatham0
    No heat & humidity
  • 3.3 inches monthly rainfall in September in Chatham3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in September in Chatham6
    6 (High) UV index
  • 63°F sea temperature in September in Chatham63
    63°F sea temperature

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The September weather guide for Massachusetts (Chatham) 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 Chatham in September?

Daytime temperatures usually reach 70°F in Chatham in September, falling to 57°F at night.

How sunny is it in Chatham in September?

There are normally 8 hours of bright sunshine each day in Chatham in September - that's 60% of daylight hours.

How warm is the sea around Chatham in September?

The average sea temperature around Chatham in September is 63°F.

Does it rain in Chatham in September?

There are usually 8 days with some rain in Chatham in September and the average monthly rainfall is 3.3 inches.

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

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

Chatham September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:06 18:13
Monday, 15th September 2025 05:20 17:49
Tuesday, 30th September 2025 05:36 17:23

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