Illinois (Chicago)
October
Weather in Illinois for October 2027
Your guide to Illinois weather in October - trends and predictions
In general, the average temperature in Illinois at the beginning of October is 21.2 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14.8 °C by the end of October.
Illinois experiences moderate rainfall in October, with an average of 9 rainy days and a total precipitation of 113.5 mm.
Is October a good time to visit Illinois? check out the best time to travel to Illinois page.
✨ Is October a good time to visit Illinois? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
9
Rainy days
0
Snow days
17°/11°
Temperatures
23 km/h
Avg max wind
65 %
Avg humidity
Illinois Weather October
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What’s the Weather Like in Illinois This October?
Discover the average temperatures and weather trends across Illinois’s cities this October.
Temperatures trend during October in Illinois
See the weather trend as well as the moving average line
October weather in Illinois day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Oct. 1 |  Light rain | 22° /16° | 7.1 mm | 5 | |
| Oct. 2 |  Patchy rain possible | 21° /16° | 1.1 mm | 5 | |
| Oct. 3 | Light rain | 23° /15° | 3.1 mm | 5 | |
| Oct. 4 | Patchy rain possible | 23° /16° | 2.2 mm | 4.9 | |
| Oct. 5 | Light rain | 22° /15° | 6.7 mm | 4.8 | |
| Oct. 6 | Light rain | 22° /14° | 3.5 mm | 4.7 | |
| Oct. 7 | Light rain | 17° /12° | 3.7 mm | 4 | |
| Oct. 8 |  Partly cloudy | 17° /11° | 0.3 mm | 4 | |
| Oct. 9 |  Sunny | 19° /12° | 0.2 mm | 4.5 | |
| Oct. 10 | Sunny | 20° /13° | 0 mm | 4.4 | |
| Oct. 11 |  Moderate or heavy rain shower | 20° /13° | 5.9 mm | 4.3 | |
| Oct. 12 | Moderate or heavy rain shower | 20° /14° | 5 mm | 4 | |
| Oct. 13 |  Moderate rain | 18° /13° | 13.6 mm | 4 | |
| Oct. 14 | Moderate or heavy rain shower | 16° /12° | 9.8 mm | 3 | |
| Oct. 15 | Moderate rain | 14° /10° | 13.1 mm | 3 | |
| Oct. 16 |  Overcast | 15° /9° | 0.5 mm | 3 | |
| Oct. 17 | Partly cloudy | 15° /7° | 0.2 mm | 3.8 | |
| Oct. 18 | Sunny | 18° /8° | 0 mm | 3.8 | |
| Oct. 19 | Light rain | 16° /9° | 4.8 mm | 3.7 | |
| Oct. 20 | Sunny | 18° /9° | 0.2 mm | 3.6 | |
| Oct. 21 | Sunny | 18° /10° | 0.5 mm | 3.5 | |
| Oct. 22 | Overcast | 16° /10° | 0 mm | 3.5 | |
| Oct. 23 | Partly cloudy | 17° /10° | 0 mm | 3.4 | |
| Oct. 24 | Light rain | 17° /10° | 6.9 mm | 3.3 | |
| Oct. 25 | Moderate rain | 16° /11° | 10.2 mm | 3 | |
| Oct. 26 | Overcast | 15° /11° | 0.8 mm | 3 | |
| Oct. 27 | Patchy rain possible | 16° /10° | 1 mm | 3 | |
| Oct. 28 | Patchy rain possible | 15° /9° | 2.3 mm | 3 | |
| Oct. 29 | Light rain | 16° /11° | 3.6 mm | 3 | |
| Oct. 30 | Overcast | 14° /9° | 0.4 mm | 3 | |
| Oct. 31 | Patchy rain possible | 13° /8° | 1.5 mm | 2 | |
| Next | |||||
Important Notice
Our weather forecast for Illinois in October is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Illinois forecast closer to your planned date for the most up-to-date weather information.
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Illinois in October - FAQ
What are the expected maximum and minimum temperatures in Illinois during October?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Illinois during October?
Significant rainfall exceeding 113.5 mm is expected in Illinois during October, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Illinois in October 2027?
Illinois typically sees 0 cm of snowfall during October.
What are the typical wind conditions in Illinois during October?
The average wind speed in Illinois during October is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Illinois
Explore the daily rainfall trends and prepare for Illinoiss October weather 💧
Typically, Illinois has 9 rainy days in October with a total of 113.5 mm of rainfall.
UV exposure in Illinois during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
Counties in Illinois
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