Isle Royale weather in August 2025

Expect 72°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Isle Royale in August. Check more long-term weather averages for Isle Royale in August before you book your next holiday to Michigan in 2025/2026.

  • 72°F maximum daytime temperature in August in Isle Royale72
    72°F max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in August in Isle Royale12
    12 days with some rainfall
  • 52°F minimum night-time temperature in August in Isle Royale52
    52°F min night temperature
  • 14 hours of daylight per day in August in Isle Royale14
    14 hours of daylight per day
  • No heat & humidity in August in Isle Royale0
    No heat & humidity
  • 3.3 inches monthly rainfall in August in Isle Royale3.3
    3.3 inches of monthly rainfall
  • UV (maximum) index 6 (High) in August in Isle Royale6
    6 (High) UV index
  • 55°F sea temperature in August in Isle Royale55
    55°F sea temperature

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The August weather guide for Michigan (Isle Royale) 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 Isle Royale in August?

Daytime temperatures usually reach 72°F in Isle Royale in August, falling to 52°F at night.

How sunny is it in Isle Royale in August?

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

How warm is the sea around Isle Royale in August?

The average sea temperature around Isle Royale in August is 55°F.

Does it rain in Isle Royale in August?

There are usually 12 days with some rain in Isle Royale in August and the average monthly rainfall is 3.3 inches.

Isle Royale August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:31 20:30
Saturday, 16th August 2025 05:51 20:05
Sunday, 31st August 2025 06:11 19:37

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