Block Island weather in September 2025

Expect 22°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Block Island in September. Check more long-term weather averages for Block Island in September before you book your next holiday to Rhode Island in 2025/2026.

  • 22°C maximum daytime temperature in September in Block Island22
    22°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in September in Block Island9
    9 days with some rainfall
  • 13°C minimum night-time temperature in September in Block Island13
    13°C min night temperature
  • 12 hours of daylight per day in September in Block Island12
    12 hours of daylight per day
  • No heat & humidity in September in Block Island0
    No heat & humidity
  • 97 mm monthly rainfall in September in Block Island97
    97 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Block Island6
    6 (High) UV index
  • 19°C sea temperature in September in Block Island19
    19°C sea temperature

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The September weather guide for Rhode Island (Block Island) 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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How hot is it in Block Island in September?

Daytime temperatures usually reach 22°C in Block Island in September, falling to 13°C at night.

How sunny is it in Block Island in September?

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

How warm is the sea around Block Island in September?

The average sea temperature around Block Island in September is 19°C.

Does it rain in Block Island in September?

There are usually 9 days with some rain in Block Island in September and the average monthly rainfall is 97mm.

What is the chance of a hurricane in Block Island in September?

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

Block Island September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:13 18:18
Monday, 15th September 2025 05:27 17:55
Tuesday, 30th September 2025 05:42 17:29

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