- Save up to 35% on breaks with Radisson Hotels
- Book stays in London, Amsterdam, Dubai, Stockholm & more
- Travel between 12th Dec 2024 & 31st Dec 2025 (inclusive)
Illinois weather in October 2025
Expect 17°C 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.
- 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
More about Illinois
- Overview
- Best time to visit
- Weather by month
- 5-day weather forecast
- Destinations
- Travel advice
- Deals & discounts
Illinois by month
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Recommended for Illinois
Expires at 23:59 on Wednesday 4th Dec 2024 · View all Radisson Hotels offers
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 / mm) | Imperial (°F / inches)
More about the USA
How warm is it in Illinois in October?
Daytime temperatures usually reach 17°C in Chicago, Illinois in October, falling to 6°C 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 14°C.
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 68mm.
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 |
Be inspired
Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers
We promise not to share your details
Related posts
Popular travel offers
Explore holidays in the sun for less
- Beach holidays
- Family holidays
- City breaks
- Summer holidays
- Winter sun holidays
- Holiday offers
- Top travel brands
- Airlines & flights
- Discount hotels
- Airport parking deals
- TUI
- Jet2holidays
- easyJet holidays
- Love Holidays
- Black Friday sales
Airport parking
- Manchester Airport
- Stansted Airport
- Bristol Airport
- Luton Airport
- Birmingham Airport
- Edinburgh Airport
- Gatwick Airport
- Glasgow Airport
- Newcastle Airport
Airport lounges
- Manchester Airport
- Birmingham Airport
- Bristol Airport
- Edinburgh Airport
- Glasgow Airport
- Heathrow Airport
- Newcastle Airport
- Stansted Airport
- Gatwick Airport