Milwaukee weather in September 2025

Expect 22°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Milwaukee in September. Check more long-term weather averages for Milwaukee in September before you book your next holiday to Wisconsin in 2025/2026.

  • 22°C maximum daytime temperature in September in Milwaukee22
    22°C max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in September in Milwaukee10
    10 days with some rainfall
  • 12°C minimum night-time temperature in September in Milwaukee12
    12°C min night temperature
  • 12 hours of daylight per day in September in Milwaukee12
    12 hours of daylight per day
  • No heat & humidity in September in Milwaukee0
    No heat & humidity
  • 82 mm monthly rainfall in September in Milwaukee82
    82 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Milwaukee6
    6 (High) UV index
  • 19°C sea temperature in September in Milwaukee19
    19°C sea temperature

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The September weather guide for Wisconsin (Milwaukee) 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 Milwaukee in September?

Daytime temperatures usually reach 22°C in Milwaukee in September, falling to 12°C at night.

How sunny is it in Milwaukee in September?

There are normally 7 hours of bright sunshine each day in Milwaukee in September - that's 57% of daylight hours.

How warm is the sea around Milwaukee in September?

The average sea temperature around Milwaukee in September is 19°C.

Does it rain in Milwaukee in September?

There are usually 10 days with some rain in Milwaukee in September and the average monthly rainfall is 82mm.

Milwaukee September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:16 18:26
Monday, 15th September 2025 05:32 18:01
Tuesday, 30th September 2025 05:48 17:34

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