Iowa weather in September 2025

Expect 24°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Iowa in September. Check more long-term weather averages for Iowa in September before you book your next holiday to Iowa in 2025/2026.

  • 24°C maximum daytime temperature in September in Iowa (Des Moines)24
    24°C max day temperature
  • 8 hours of sunshine per day
  • 9 days with some rainfall in September in Iowa (Des Moines)9
    9 days with some rainfall
  • 12°C minimum night-time temperature in September in Iowa (Des Moines)12
    12°C min night temperature
  • 12 hours of daylight per day in September in Iowa (Des Moines)12
    12 hours of daylight per day
  • No heat & humidity in September in Iowa (Des Moines)0
    No heat & humidity
  • 91 mm monthly rainfall in September in Iowa (Des Moines)91
    91 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in Iowa (Des Moines)6
    6 (High) UV index

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The September weather guide for Iowa (Des Moines) 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 Iowa destinations

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

All Iowa destinations

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

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How hot is it in Iowa in September?

Daytime temperatures usually reach 24°C in Des Moines, Iowa in September, falling to 12°C at night.

How sunny is it in Iowa in September?

There are normally 8 hours of bright sunshine each day in Des Moines, Iowa in September - that's 64% of daylight hours.

Does it rain in Iowa in September?

There are usually 9 days with some rain in Des Moines, Iowa in September and the average monthly rainfall is 91mm.

Iowa September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:41 18:47
Monday, 15th September 2025 05:55 18:23
Tuesday, 30th September 2025 06:11 17:57

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