Michigan weather in September 2025

Expect 23°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Michigan in September. Check more long-term weather averages for Michigan in September before you book your next holiday to Michigan in 2025/2026.

  • 23°C maximum daytime temperature in September in Michigan (Detroit)23
    23°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Michigan (Detroit)10
    10 days with some rainfall
  • 13°C minimum night-time temperature in September in Michigan (Detroit)13
    13°C min night temperature
  • 12 hours of daylight per day in September in Michigan (Detroit)12
    12 hours of daylight per day
  • No heat & humidity in September in Michigan (Detroit)0
    No heat & humidity
  • 73 mm monthly rainfall in September in Michigan (Detroit)73
    73 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Michigan (Detroit)6
    6 (High) UV index
  • 20°C sea temperature in September in Michigan (Detroit)20
    20°C sea temperature

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The September weather guide for Michigan (Detroit) 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.

Top Michigan destinations

Below are average maximum temperatures at popular countries, regions and places in Michigan in September. Select a holiday destination to see more weather parameters.

All Michigan destinations

Metric (°C / mm)  |  Imperial (°F / inches)

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More about the USA

How hot is it in Michigan in September?

Daytime temperatures usually reach 23°C in Detroit, Michigan in September, falling to 13°C at night.

How sunny is it in Michigan in September?

There are normally 7 hours of bright sunshine each day in Detroit, Michigan in September - that's 54% of daylight hours.

How warm is the sea around Michigan in September?

The average sea temperature around Detroit, Michigan in September is 20°C.

Does it rain in Michigan in September?

There are usually 10 days with some rain in Detroit, Michigan in September and the average monthly rainfall is 73mm.

Michigan September sunrise & sunset times

Browse the sunrise and sunset times for Michigan in September 2025. Select a month to view Michigan sunrise and sunset times for the next 12 months. The Michigan sunrise and sunset times shown below are for Detroit.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:58 19:06
Monday, 15th September 2025 06:12 18:41
Tuesday, 30th September 2025 06:29 18:15

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