Nantucket weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Nantucket in September. Check more long-term weather averages for Nantucket in September before you book your next holiday to Massachusetts in 2025/2026.

  • 21°C maximum daytime temperature in September in Nantucket21
    21°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Nantucket8
    8 days with some rainfall
  • 14°C minimum night-time temperature in September in Nantucket14
    14°C min night temperature
  • 12 hours of daylight per day in September in Nantucket12
    12 hours of daylight per day
  • No heat & humidity in September in Nantucket0
    No heat & humidity
  • 86 mm monthly rainfall in September in Nantucket86
    86 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Nantucket6
    6 (High) UV index
  • 18°C sea temperature in September in Nantucket18
    18°C sea temperature

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The September weather guide for Massachusetts (Nantucket) 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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More about the USA

How hot is it in Nantucket in September?

Daytime temperatures usually reach 21°C in Nantucket in September, falling to 14°C at night.

How sunny is it in Nantucket in September?

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

How warm is the sea around Nantucket in September?

The average sea temperature around Nantucket in September is 18°C.

Does it rain in Nantucket in September?

There are usually 8 days with some rain in Nantucket in September and the average monthly rainfall is 86mm.

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

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

Nantucket September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:07 18:13
Monday, 15th September 2025 05:21 17:49
Tuesday, 30th September 2025 05:36 17:23

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