Marion weather in September 2025

Expect daytime maximum temperatures of 27°C in Marion, Illinois in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 81 mm of rainfall in the month.

  • 27°C maximum daytime temperature in September in Marion27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Marion8
    8 days with some rainfall
  • 14°C minimum night-time temperature in September in Marion14
    14°C min night temperature
  • 12 hours of daylight per day in September in Marion12
    12 hours of daylight per day
  • Low heat & humidity in September in MarionL
    Low heat & humidity
  • 81 mm monthly rainfall in September in Marion81
    81 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Marion7
    7 (High) UV index

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The September weather guide for Illinois (Marion) 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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How hot is it in Marion in September?

Daytime temperatures usually reach 27°C in Marion in September with low heat and humidity, falling to 14°C at night.

How sunny is it in Marion in September?

There are normally 8 hours of bright sunshine each day in Marion in September - that's 65% of daylight hours.

Does it rain in Marion in September?

There are usually 8 days with some rain in Marion in September and the average monthly rainfall is 81mm.

Marion September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:26 18:24
Monday, 15th September 2025 05:38 18:03
Tuesday, 30th September 2025 05:51 17:40

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