Isle Royale weather in September 2024

Expect 17°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Isle Royale in September. Check more long-term weather averages for Isle Royale in September before you book your next holiday to Michigan in 2024/2025.

  • 17°C maximum daytime temperature in September in Isle Royale17
    17°C max day temperature
  • 6 hours of sunshine per day
  • 13 days with some rainfall in September in Isle Royale13
    13 days with some rainfall
  • 7°C minimum night-time temperature in September in Isle Royale7
    7°C min night temperature
  • 13 hours of daylight per day in September in Isle Royale13
    13 hours of daylight per day
  • No heat & humidity in September in Isle Royale0
    No heat & humidity
  • 86 mm monthly rainfall in September in Isle Royale86
    86 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Isle Royale5
    5 (Moderate) UV index
  • 12°C sea temperature in September in Isle Royale12
    12°C sea temperature

More about Isle Royale

Isle Royale by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec