Nantucket weather in July 2025

Expect daytime maximum temperatures of 25°C in Nantucket, Massachusetts in July based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 66 mm of rainfall in the month.

  • 25°C maximum daytime temperature in July in Nantucket25
    25°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in July in Nantucket9
    9 days with some rainfall
  • 18°C minimum night-time temperature in July in Nantucket18
    18°C min night temperature
  • 15 hours of daylight per day in July in Nantucket15
    15 hours of daylight per day
  • No heat & humidity in July in Nantucket0
    No heat & humidity
  • 66 mm monthly rainfall in July in Nantucket66
    66 mm of monthly rainfall
  • UV (maximum) index 8 (Very High) in July in Nantucket8
    8 (Very High) UV index
  • 18°C sea temperature in July in Nantucket18
    18°C sea temperature

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The July 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Nantucket in July?

Daytime temperatures usually reach 25°C in Nantucket in July with no heat and humidity, falling to 18°C at night.

How sunny is it in Nantucket in July?

There are normally 8 hours of bright sunshine each day in Nantucket in July - that's 56% of daylight hours.

How warm is the sea around Nantucket in July?

The average sea temperature around Nantucket in July is 18°C.

Does it rain in Nantucket in July?

There are usually 9 days with some rain in Nantucket in July and the average monthly rainfall is 66mm.

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

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

Nantucket July sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Tuesday, 1st July 2025 04:11 19:17
Wednesday, 16th July 2025 04:21 19:11
Thursday, 31st July 2025 04:35 18:58

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