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Will County (Joliet)
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United States weather

Weather in Will County, Illinois for September 2025

Your guide to Will County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Will County is cooler than usual, with temperatures averaging 23.3 °F, this is -3.5 °F below the typical seasonal average.

  • The forecast for the coming days of September 2025 predicts a temperature of 31.1 °F , which is warmer than usual.

  • In general, the average temperature in Will County at the beginning of September is 26.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 30.7 °F by the end of September.

    • Rain 🌧️

  • Will County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 62.2 mm.

    • More

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Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/14°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
65 %
Avg humidity

Will County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
27°
2
Mist
28°
3
Fog
29°
4
Mist
29°
5
Cloudy
29°
6
Patchy rain possible
24°
7
Overcast
22°
8
Partly cloudy
23°
9
Mist
26°
10
Partly cloudy
28°
11
Light rain shower
28°
12
Fog
28°
13
Mist
27°
14
Mist
29°
15
Sunny
32°
16
Sunny
31°
17
Sunny
30°
18
Sunny
32°
19
Sunny
28°
20
Sunny
31°
21
Patchy rain possible
32°
22
Patchy rain possible
24°
23
Mist
31°
24
Partly cloudy
29°
25
Sunny
30°
26
Sunny
33°
27
Sunny
36°
28
Sunny
37°
29
Fog
23°
30
Fog
27°

Temperatures trend during September in Will County

See the weather trend as well as the moving average line

September weather in Will County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 27° /11° 0 mm 6
Sept. 2 Mist
Mist
 28° /13° 0 mm 6
Sept. 3 Fog
Fog
 29° /13° 10 mm 7
Sept. 4 Mist
Mist
 29° /12° 0 mm 7
Sept. 5 Cloudy
Cloudy
 29° /15° 1.2 mm 7
Sept. 6 Patchy rain possible
Patchy rain possible
 24° /11° 1.6 mm 5
Sept. 7 Overcast
Overcast
 22° /9° 0 mm 5
Sept. 8 Partly cloudy
Partly cloudy
 23° /8° 0 mm 6
Sept. 9 Mist
Mist
 26° /9° 0 mm 6
Sept. 10 Partly cloudy
Partly cloudy
 28° /11° 0 mm 7
Sept. 11 Light rain shower
Light rain shower
 28° /15° 11.1 mm 7
Sept. 12 Fog
Fog
 28° /12° 0 mm 6
Sept. 13 Mist
Mist
 27° /15° 0 mm 6
Sept. 14 Mist
Mist
 29° /14° 0 mm 7
Sept. 15 Sunny
Sunny
 32° /14° 0 mm 1.5
Sept. 16 Sunny
Sunny
 31° /14° 0 mm 1.4
Sept. 17 Sunny
Sunny
 30° /14° 0 mm 1.5
Sept. 18 Sunny
Sunny
 32° /17° 0 mm 1.4
Sept. 19 Sunny
Sunny
 28° /17° 0 mm 0
Sept. 20 Sunny
Sunny
 31° /15° 0 mm 6
Sept. 21 Patchy rain possible
Patchy rain possible
 32° /17° 0.4 mm 5
Sept. 22 Patchy rain possible
Patchy rain possible
 24° /18° 0.3 mm 5
Sept. 23 Mist
Mist
 31° /17° 0.1 mm 5
Sept. 24 Partly cloudy
Partly cloudy
 29° /18° 0.1 mm 6
Sept. 25 Sunny
Sunny
 30° /18° 0 mm 6
Sept. 26 Sunny
Sunny
 33° /18° 0 mm 6
Sept. 27 Sunny
Sunny
 36° /20° 0 mm 7
Sept. 28 Sunny
Sunny
 37° /21° 0 mm 7
Sept. 29 Fog
Fog
 23° /16° 0 mm 6
Sept. 30 Fog
Fog
 27° /15° 0 mm 6
Next
Important Notice
Our weather forecast for Will County in September 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 Will County forecast closer to your planned date for the most up-to-date weather information.
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Will County in September - FAQ

What are the expected maximum and minimum temperatures in Will County during September?
Enjoy moderate daytime temperatures of up to 27° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Will County during September?
Moderate rainfall is anticipated in Will County during September, with a total of 62.2 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Will County during September?
The average wind speed in Will County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Will County

Explore the daily rainfall trends and prepare for Will Countys September weather 💧

UV exposure in Will County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in Will County
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BolingbrookJoliet
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Location coordinates Where is Will County?

Get accurate weather forecasts for Will County, located at latitude 41.525 and longitude -88.083. Stay updated with localized weather information tailored for Will County.

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