Block Island weather in August 2025

Q: How hot is it in Block Island in August?

Daytime temperatures usually reach 26°C in Block Island in August with low heat and humidity, falling to 17°C at night.

Q: How sunny is it in Block Island in August?

There are normally 8 hours of bright sunshine each day in Block Island in August - that's 58% of daylight hours.

Q: How warm is the sea around Block Island in August?

The average sea temperature around Block Island in August is 20°C.

Q: Does it rain in Block Island in August?

There are usually 9 days with some rain in Block Island in August and the average monthly rainfall is 105mm.

Q: What is the chance of a cyclone in Block Island in August?

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

Expect daytime maximum temperatures of 79°F in Block Island, Rhode Island in August based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 4.1 inches of rainfall in the month.

79
79°F max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
63
63°F min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
4.1
4.1 inches of monthly rainfall
8
8 (Very High) UV index
68
68°F sea temperature

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The August 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) | Imperial (°F)

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How hot is it in Block Island in August?

Daytime temperatures usually reach 79°F in Block Island in August with low heat and humidity, falling to 63°F at night.

How sunny is it in Block Island in August?

There are normally 8 hours of bright sunshine each day in Block Island in August - that's 58% of daylight hours.

How warm is the sea around Block Island in August?

The average sea temperature around Block Island in August is 68°F.

Does it rain in Block Island in August?

There are usually 9 days with some rain in Block Island in August and the average monthly rainfall is 4.1 inches.

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

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

Block Island August sunrise & sunset times

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

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Friday, 1st August 2025	04:42	19:03
Saturday, 16th August 2025	04:57	18:43
Sunday, 31st August 2025	05:12	18:20

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Rhode Island - quick facts
Flight time^✝	11 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Tourist info	Commerce RI Tourism