Chicago weather in October 2025

Expect daytime maximum temperatures of 17°C in Chicago, Illinois in October based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 68 mm of rainfall in the month.

  • 17°C maximum daytime temperature in October in Chicago17
    17°C max day temperature
  • 6 hours of sunshine per day
  • 9 days with some rainfall in October in Chicago9
    9 days with some rainfall
  • 6°C minimum night-time temperature in October in Chicago6
    6°C min night temperature
  • 11 hours of daylight per day in October in Chicago11
    11 hours of daylight per day
  • No heat & humidity in October in Chicago0
    No heat & humidity
  • 68 mm monthly rainfall in October in Chicago68
    68 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in October in Chicago4
    4 (Moderate) UV index
  • 14°C sea temperature in October in Chicago14
    14°C sea temperature

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The October weather guide for Illinois (Chicago) 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 warm is it in Chicago in October?

Daytime temperatures usually reach 17°C in Chicago in October, falling to 6°C at night.

How sunny is it in Chicago in October?

There are normally 6 hours of bright sunshine each day in Chicago in October - that's 56% of daylight hours.

How warm is the sea around Chicago in October?

The average sea temperature around Chicago in October is 14°C.

Does it rain in Chicago in October?

There are usually 9 days with some rain in Chicago in October and the average monthly rainfall is 68mm.

Chicago October sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 05:48 17:32
Thursday, 16th October 2025 06:04 17:07
Friday, 31st October 2025 06:22 16:46

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