Block Island weather in August 2025

Expect 79°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Block Island in August. Check more long-term weather averages for Block Island in August before you book your next holiday to Rhode Island in 2025/2026.

  • 79°F maximum daytime temperature in August in Block Island79
    79°F max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in August in Block Island9
    9 days with some rainfall
  • 63°F minimum night-time temperature in August in Block Island63
    63°F min night temperature
  • 14 hours of daylight per day in August in Block Island14
    14 hours of daylight per day
  • Low heat & humidity in August in Block IslandL
    Low heat & humidity
  • 4.1 inches monthly rainfall in August in Block Island4.1
    4.1 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Block Island8
    8 (Very High) UV index
  • 68°F sea temperature in August in Block Island68
    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.

JanFebMarAprMayJunJulAugSepOctNovDec

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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