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Illinois weather in October 2025
Expect 63°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in Illinois in October. Check more long-term weather averages for Illinois in October before you book your next holiday to Illinois in 2025/2026.
- 6363°F max day temperature
- 6 hours of sunshine per day
- 99 days with some rainfall
- 4343°F min night temperature
- 1111 hours of daylight per day
- 0No heat & humidity
- 2.72.7 inches of monthly rainfall
- 44 (Moderate) UV index
- 5757°F sea temperature
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Recommended for Illinois
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.
Top Illinois destinations
Below are average maximum temperatures at popular countries, regions and places in Illinois in October. Select a holiday destination to see more weather parameters.
All Illinois destinations
Metric (°C) | Imperial (°F)
More about the USA
How warm is it in Illinois in October?
Daytime temperatures usually reach 63°F in Chicago, Illinois in October, falling to 43°F at night.
How sunny is it in Illinois in October?
There are normally 6 hours of bright sunshine each day in Chicago, Illinois in October - that's 56% of daylight hours.
How warm is the sea around Illinois in October?
The average sea temperature around Chicago, Illinois in October is 57°F.
Does it rain in Illinois in October?
There are usually 9 days with some rain in Chicago, Illinois in October and the average monthly rainfall is 2.7 inches.
Illinois October sunrise & sunset times
Browse the sunrise and sunset times for Illinois in October 2025. Select a month to view Illinois sunrise and sunset times for the next 12 months. The Illinois sunrise and sunset times shown below are for Chicago.
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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