Grand Marais weather in August 2025

Expect 23°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Grand Marais in August. Check more long-term weather averages for Grand Marais in August before you book your next holiday to Michigan in 2025/2026.

  • 23°C maximum daytime temperature in August in Grand Marais23
    23°C max day temperature
  • 8 hours of sunshine per day
  • 12 days with some rainfall in August in Grand Marais12
    12 days with some rainfall
  • 11°C minimum night-time temperature in August in Grand Marais11
    11°C min night temperature
  • 14 hours of daylight per day in August in Grand Marais14
    14 hours of daylight per day
  • No heat & humidity in August in Grand Marais0
    No heat & humidity
  • 88 mm monthly rainfall in August in Grand Marais88
    88 mm of monthly rainfall
  • UV (maximum) index 7 (High) in August in Grand Marais7
    7 (High) UV index
  • 15°C sea temperature in August in Grand Marais15
    15°C sea temperature

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The August weather guide for Michigan (Grand Marais) 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 Grand Marais in August?

Daytime temperatures usually reach 23°C in Grand Marais in August, falling to 11°C at night.

How sunny is it in Grand Marais in August?

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

How warm is the sea around Grand Marais in August?

The average sea temperature around Grand Marais in August is 15°C.

Does it rain in Grand Marais in August?

There are usually 12 days with some rain in Grand Marais in August and the average monthly rainfall is 88mm.

Grand Marais August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 05:25 20:15
Saturday, 16th August 2025 05:44 19:52
Sunday, 31st August 2025 06:03 19:24

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