Chicago weather in October 2025

Expect 17°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Chicago in October. Check more long-term weather averages for Chicago in October before you book your next holiday to Illinois in 2025/2026.

  • 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

More about Chicago

Chicago by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Chicago

  • Search for cheap car hire prices from top car hire providers
  • Filter car hire deals by price, car type, brand & more
  • Brands include Avis, Enterprise, Europcar, Hertz, Sixt & Thifty

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^