Decatur weather in October 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Decatur in October. Check more long-term weather averages for Decatur in October before you book your next holiday to Illinois in 2025/2026.

  • 20°C maximum daytime temperature in October in Decatur20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 8 days with some rainfall in October in Decatur8
    8 days with some rainfall
  • 6°C minimum night-time temperature in October in Decatur6
    6°C min night temperature
  • 11 hours of daylight per day in October in Decatur11
    11 hours of daylight per day
  • No heat & humidity in October in Decatur0
    No heat & humidity
  • 70 mm monthly rainfall in October in Decatur70
    70 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in October in Decatur4
    4 (Moderate) UV index

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Decatur by month

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The October weather guide for Illinois (Decatur) 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 Decatur in October?

Daytime temperatures usually reach 20°C in Decatur in October, falling to 6°C at night.

How sunny is it in Decatur in October?

There are normally 7 hours of bright sunshine each day in Decatur in October - that's 60% of daylight hours.

Does it rain in Decatur in October?

There are usually 8 days with some rain in Decatur in October and the average monthly rainfall is 70mm.

Decatur October sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 05:52 17:38
Thursday, 16th October 2025 06:08 17:14
Friday, 31st October 2025 06:24 16:54

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