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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 max day temperature
22 - 8 hours of sunshine per day
- 9 days with some rainfall
9 - 13°C min night temperature
13 - 12 hours of daylight per day
12 - No heat & humidity
0 - 97 mm of monthly rainfall
97 - 6 (High) UV index
6 - 19°C sea temperature
19
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Recommended for Rhode Island
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)
More about the USA
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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