Mackinac Island weather in August 2025

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

  • 75°F maximum daytime temperature in August in Mackinac Island75
    75°F max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in August in Mackinac Island12
    12 days with some rainfall
  • 54°F minimum night-time temperature in August in Mackinac Island54
    54°F min night temperature
  • 14 hours of daylight per day in August in Mackinac Island14
    14 hours of daylight per day
  • No heat & humidity in August in Mackinac Island0
    No heat & humidity
  • 3.1 inches monthly rainfall in August in Mackinac Island3.1
    3.1 inches of monthly rainfall
  • UV (maximum) index 7 (High) in August in Mackinac Island7
    7 (High) UV index
  • 61°F sea temperature in August in Mackinac Island61
    61°F sea temperature

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The August weather guide for Michigan (Mackinac 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 Mackinac Island in August?

Daytime temperatures usually reach 75°F in Mackinac Island in August, falling to 54°F at night.

How sunny is it in Mackinac Island in August?

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

How warm is the sea around Mackinac Island in August?

The average sea temperature around Mackinac Island in August is 61°F.

Does it rain in Mackinac Island in August?

There are usually 12 days with some rain in Mackinac Island in August and the average monthly rainfall is 3.1 inches.

Mackinac Island August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:22 20:07
Saturday, 16th August 2025 05:40 19:45
Sunday, 31st August 2025 05:59 19:18

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