Nantucket weather in September 2026

Q: How hot is it in Nantucket in September?

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

Q: How sunny is it in Nantucket in September?

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

Q: How warm is the sea around Nantucket in September?

The average sea temperature around Nantucket in September is 16°C.

Q: 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 82mm.

Q: 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.

Expect daytime maximum temperatures of 21°C in Nantucket, Massachusetts in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 86 mm of rainfall in the month.

21
21°C max day temperature
8
8 hours of sunshine per day
8
8 days with some rainfall
14
14°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
86
86 mm of monthly rainfall
6
6 (High) UV index
18
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)

More about Massachusetts

How hot is it in Nantucket in September?

Daytime temperatures usually reach 23°C in Nantucket in September, falling to 12°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 61% of daylight hours.

How warm is the sea around Nantucket in September?

The average sea temperature around Nantucket in September is 16°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 82mm.

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 2026. Select a month to view Nantucket sunrise and sunset times for the next 12 months.

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