Cook County (Chicago)
October
Weather in Cook County for October 2025
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 22.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.6 °F by the end of October.
Expect significant rainfall in Cook County during October, with an average of 17 rainy days.
Snowfall in Cook County during October is quite rare, with fewer than 2 snowy days on average.
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13
Dry days
17
Rainy days
1
Snow days
16°/10°
Temperatures
24 km/h
Avg max wind
68 %
Avg humidity
Cook County in October average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  24° | 3 25° | 4  24° | 5  24° | ||
| 6 21° | 7  15° | 8  17° | 9 17° | 10  17° | 11 21° | 12  17° |
| 13 16° | 14 13° | 15 11° | 16 13° | 17  17° | 18 20° | 19 17° |
| 20 19° | 21 20° | 22 16° | 23 18° | 24 20° | 25 18° | 26 17° |
| 27 19° | 28 13° | 29 17° | 30 14° | 31  11° |
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Temperatures trend during October in Cook County
See the weather trend as well as the moving average line
October weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Oct. 1 | Fog | 23° /15° | 0 mm | 0 cm | |
| Oct. 2 | Sunny | 24° /15° | 0 mm | 0 cm | |
| Oct. 3 | Sunny | 25° /14° | 0 mm | 0 cm | |
| Oct. 4 | Patchy rain possible | 24° /18° | 3.4 mm | 0 cm | |
| Oct. 5 | Moderate or heavy rain with thunder | 24° /16° | 20.2 mm | 0 cm | |
| Oct. 6 | Light rain shower | 21° /12° | 0.4 mm | 0 cm | |
| Oct. 7 | Cloudy | 15° /8° | 0 mm | 0 cm | |
| Oct. 8 | Light drizzle | 17° /9° | 0.3 mm | 0 cm | |
| Oct. 9 | Patchy rain possible | 17° /10° | 0.1 mm | 0 cm | |
| Oct. 10 | Partly cloudy | 17° /9° | 0 mm | 0 cm | |
| Oct. 11 | Patchy light rain | 21° /10° | 2.9 mm | 0 cm | |
| Oct. 12 | Moderate or heavy rain shower | 17° /12° | 12.5 mm | 0 cm | |
| Oct. 13 | Light rain shower | 16° /11° | 31.9 mm | 0 cm | |
| Oct. 14 | Light rain shower | 13° /10° | 16.3 mm | 0 cm | |
| Oct. 15 | Light rain shower | 11° /8° | 17.5 mm | 0 cm | |
| Oct. 16 | Patchy rain possible | 13° /7° | 0.3 mm | 0 cm | |
| Oct. 17 | Overcast | 17° /6° | 0 mm | 0 cm | |
| Oct. 18 | Overcast | 20° /7° | 0 mm | 0 cm | |
| Oct. 19 | Moderate or heavy rain with thunder | 17° /10° | 1.6 mm | 0 cm | |
| Oct. 20 | Patchy rain possible | 19° /10° | 0.5 mm | 0 cm | |
| Oct. 21 | Light rain shower | 20° /11° | 1.1 mm | 0 cm | |
| Oct. 22 | Cloudy | 16° /8° | 0 mm | 0 cm | |
| Oct. 23 | Cloudy | 18° /9° | 0 mm | 0 cm | |
| Oct. 24 | Patchy rain possible | 20° /9° | 0.5 mm | 0 cm | |
| Oct. 25 | Light rain | 18° /12° | 7.1 mm | 0 cm | |
| Oct. 26 | Patchy rain possible | 17° /13° | 1 mm | 0 cm | |
| Oct. 27 | Light drizzle | 19° /10° | 3 mm | 0 cm | |
| Oct. 28 | Overcast | 13° /6° | 0 mm | 0 cm | |
| Oct. 29 | Light rain shower | 17° /10° | 6.4 mm | 0 cm | |
| Oct. 30 | Partly cloudy | 14° /8° | 0 mm | 0 cm | |
| Oct. 31 | Moderate snow | 11° /5° | 4 mm | 0.1 cm | |
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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.
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 16° and cooler nights around 10°. 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 165.1 mm is expected in Cook County during October, occurring over more than 17 days. Preparing for wet conditions is recommended in your planning.
Is snowfall common in Cook County during October?
Cook County experiences an average snowfall of 0.1 cm during October, occurring over 1 days, which may interest winter sports enthusiasts.
What are the typical wind conditions in Cook County during October?
The average wind speed in Cook County during October is 24 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 💧
October snowfall in Cook County
Track daily snowfall levels and discover Cook County’s snowy potential this October ❄️
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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Where is Cook County?Get accurate weather forecasts for Cook County, located at latitude 41.85 and longitude -87.65. Stay updated with localized weather information tailored for Cook County.
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