Detroit weather in September 2025

Expect daytime maximum temperatures of 23°C in Detroit, Michigan in September based on long-term weather averages. There are 7 hours of sunshine per day on average with 10 days with some rainfall and typically 73 mm of rainfall in the month.

  • 23°C maximum daytime temperature in September in Detroit23
    23°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Detroit10
    10 days with some rainfall
  • 13°C minimum night-time temperature in September in Detroit13
    13°C min night temperature
  • 12 hours of daylight per day in September in Detroit12
    12 hours of daylight per day
  • No heat & humidity in September in Detroit0
    No heat & humidity
  • 73 mm monthly rainfall in September in Detroit73
    73 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Detroit6
    6 (High) UV index
  • 20°C sea temperature in September in Detroit20
    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.

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

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More about the USA

How hot is it in Detroit in September?

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

How sunny is it in Detroit in September?

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

How warm is the sea around Detroit in September?

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

Does it rain in Detroit in September?

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

Detroit September sunrise & sunset times

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

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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