Cook County (Chicago)
October
Weather in Cook County, Illinois for October 2027
Your guide to Cook County weather in October - trends and predictions
In general, the average temperature in Cook County 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.
Cook County 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 Cook County? check out the best time to travel to Cook County page.
✨ Is October a good time to visit Cook County? – 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
Cook County Weather October
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Temperatures trend during October in Cook County
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October weather in Cook County 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 Cook County 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 Cook County forecast closer to your planned date for the most up-to-date weather information.
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Cook County in October - FAQ
What are the expected maximum and minimum temperatures in Cook County 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 Cook County during October?
Significant rainfall exceeding 113.5 mm is expected in Cook County during October, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Cook County in October 2027?
Cook County typically sees 0 cm of snowfall during October.
What are the typical wind conditions in Cook County during October?
The average wind speed in Cook County during October is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
October rainfall patterns in Cook County
Explore the daily rainfall trends and prepare for Cook Countys October weather 💧
Typically, Cook County has 9 rainy days in October with a total of 113.5 mm of rainfall.
UV exposure in Cook County during October
Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
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