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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.
- 1717°C max day temperature
- 6 hours of sunshine per day
- 99 days with some rainfall
- 66°C min night temperature
- 1111 hours of daylight per day
- 0No heat & humidity
- 6868 mm of monthly rainfall
- 44 (Moderate) UV index
- 1414°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)
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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