Grand Marais weather in September 2025

Expect 18°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Grand Marais in September. Check more long-term weather averages for Grand Marais in September before you book your next holiday to Michigan in 2025/2026.

  • 18°C maximum daytime temperature in September in Grand Marais18
    18°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Grand Marais13
    13 days with some rainfall
  • 8°C minimum night-time temperature in September in Grand Marais8
    8°C min night temperature
  • 13 hours of daylight per day in September in Grand Marais13
    13 hours of daylight per day
  • No heat & humidity in September in Grand Marais0
    No heat & humidity
  • 92 mm monthly rainfall in September in Grand Marais92
    92 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Grand Marais5
    5 (Moderate) UV index
  • 14°C sea temperature in September in Grand Marais14
    14°C sea temperature

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The September 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 September?

Daytime temperatures usually reach 18°C in Grand Marais in September, falling to 8°C at night.

How sunny is it in Grand Marais in September?

There are normally 6 hours of bright sunshine each day in Grand Marais in September - that's 45% of daylight hours.

How warm is the sea around Grand Marais in September?

The average sea temperature around Grand Marais in September is 14°C.

Does it rain in Grand Marais in September?

There are usually 13 days with some rain in Grand Marais in September and the average monthly rainfall is 92mm.

Grand Marais September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 06:04 19:22
Monday, 15th September 2025 06:22 18:55
Tuesday, 30th September 2025 06:42 18:25

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