Nantucket weather in August 2025

Expect 75°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Nantucket in August. Check more long-term weather averages for Nantucket in August before you book your next holiday to Massachusetts in 2025/2026.

  • 75°F maximum daytime temperature in August in Nantucket75
    75°F max day temperature
  • 8 hours of sunshine per day
  • 10 days with some rainfall in August in Nantucket10
    10 days with some rainfall
  • 63°F minimum night-time temperature in August in Nantucket63
    63°F min night temperature
  • 14 hours of daylight per day in August in Nantucket14
    14 hours of daylight per day
  • No heat & humidity in August in Nantucket0
    No heat & humidity
  • 3.4 inches monthly rainfall in August in Nantucket3.4
    3.4 inches of monthly rainfall
  • UV (maximum) index 8 (Very High) in August in Nantucket8
    8 (Very High) UV index
  • 68°F sea temperature in August in Nantucket68
    68°F sea temperature

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The August 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)  |  Imperial (°F)

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More about the USA

How hot is it in Nantucket in August?

Daytime temperatures usually reach 75°F in Nantucket in August, falling to 63°F at night.

How sunny is it in Nantucket in August?

There are normally 8 hours of bright sunshine each day in Nantucket in August - that's 57% of daylight hours.

How warm is the sea around Nantucket in August?

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

Does it rain in Nantucket in August?

There are usually 10 days with some rain in Nantucket in August and the average monthly rainfall is 3.4 inches.

What is the chance of a hurricane in Nantucket in August?

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

Nantucket August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:36 18:57
Saturday, 16th August 2025 04:51 18:38
Sunday, 31st August 2025 05:06 18:14

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