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
  18°C max day temperature
• 6
  6 hours of sunshine per day
• 13
  13 days with some rainfall
• 8
  8°C min night temperature
• 13
  13 hours of daylight per day
• 0
  No heat & humidity
• 92
  92 mm of monthly rainfall
• 5
  5 (Moderate) UV index
• 14
  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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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.

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