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United States weather

Weather in Cook County, Illinois for October 2025

Your guide to Cook County weather in October - trends and predictions

    Temperatures

  • Until now, October 2025 in Cook County is slightly cooler than the historical average by -0.6 °F.

  • In general, the average temperature in Cook County at the beginning of October is 21.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 14 °F by the end of October.

    • Rain 🌧️

  • Cook County in October brings notable rainfall, with an average of 16 rainy days and a total precipitation of 120.3 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
15
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/11°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
63 %
Avg humidity

Cook County Weather October

Move between months or click on a day
September
November
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
22°
2
Sunny
22°
3
Partly cloudy
24°
4
Moderate rain at times
23°
5
Cloudy
24°
6
Patchy rain possible
22°
7
Moderate or heavy rain shower
16°
8
Partly cloudy
17°
9
Sunny
19°
10
Sunny
19°
11
Moderate or heavy rain shower
21°
12
Moderate or heavy rain shower
19°
13
Overcast
17°
14
Moderate or heavy rain shower
15°
15
Moderate or heavy rain shower
14°
16
Overcast
15°
17
Overcast
16°
18
Sunny
19°
19
Sunny
17°
20
Sunny
19°
21
Overcast
18°
22
Overcast
16°
23
Partly cloudy
17°
24
Sunny
17°
25
Heavy rain at times
16°
26
Overcast
15°
27
Partly cloudy
15°
28
Overcast
13°
29
Overcast
15°
30
Overcast
14°
31
Partly cloudy
10°

Temperatures trend during October in Cook County

See the weather trend as well as the moving average line

October weather in Cook County day by day

Click on a date for more information
September November
Date Weather Temperatures Rain UV More
Oct. 1 Overcast
Overcast
 22° /15° 0 mm 5
Oct. 2 Sunny
Sunny
 22° /15° 0.7 mm 6
Oct. 3 Partly cloudy
Partly cloudy
 24° /15° 3.7 mm 6
Oct. 4 Moderate rain at times
Moderate rain at times
 23° /16° 2.7 mm 6
Oct. 5 Cloudy
Cloudy
 24° /16° 8.1 mm 5
Oct. 6 Patchy rain possible
Patchy rain possible
 22° /14° 4.2 mm 5
Oct. 7 Moderate or heavy rain shower
Moderate or heavy rain shower
 16° /11° 4.4 mm 4
Oct. 8 Partly cloudy
Partly cloudy
 17° /11° 0.4 mm 5
Oct. 9 Sunny
Sunny
 19° /11° 0.1 mm 5
Oct. 10 Sunny
Sunny
 19° /12° 0 mm 5
Oct. 11 Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /13° 7.1 mm 5
Oct. 12 Moderate or heavy rain shower
Moderate or heavy rain shower
 19° /13° 6 mm 4
Oct. 13 Overcast
Overcast
 17° /11° 13.2 mm 4
Oct. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /11° 9.4 mm 3
Oct. 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /9° 12.1 mm 3
Oct. 16 Overcast
Overcast
 15° /8° 0.1 mm 4
Oct. 17 Overcast
Overcast
 16° /7° 0.2 mm 4
Oct. 18 Sunny
Sunny
 19° /8° 0 mm 5
Oct. 19 Sunny
Sunny
 17° /9° 5.8 mm 4
Oct. 20 Sunny
Sunny
 19° /9° 0.2 mm 5
Oct. 21 Overcast
Overcast
 18° /10° 0.6 mm 4
Oct. 22 Overcast
Overcast
 16° /9° 0 mm 4
Oct. 23 Partly cloudy
Partly cloudy
 17° /9° 0 mm 4
Oct. 24 Sunny
Sunny
 17° /10° 8.3 mm 5
Oct. 25 Heavy rain at times
Heavy rain at times
 16° /10° 12.2 mm 4
Oct. 26 Overcast
Overcast
 15° /11° 1 mm 4
Oct. 27 Partly cloudy
Partly cloudy
 15° /9° 1.2 mm 4
Oct. 28 Overcast
Overcast
 13° /7° 2.8 mm 3
Oct. 29 Overcast
Overcast
 15° /9° 4.3 mm 4
Oct. 30 Overcast
Overcast
 14° /8° 0.4 mm 4
Oct. 31 Partly cloudy
Partly cloudy
 10° /6° 0 mm 0.6
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 120.3 mm is expected in Cook County during October, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Cook County in October 2025?
Cook County typically sees 0.0275 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 💧

UV exposure in Cook County during October

Stay informed about UV levels for safe outdoor activities throughout the month of October ☀️
Top locations in Cook County
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Chicago
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Location coordinates 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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