Will County (Joliet)
September
Weather in Will County for September 2025
Your guide to Will County weather in September - trends and predictions
In general, the average temperature in Will County at the beginning of September is 29.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24 °F by the end of September.
Will County sees moderate rainfall in September, averaging 10 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
20
Dry days
10
Rainy days
0
Snow days
27°/13°
Temperatures
17 km/h
Avg max wind
68 %
Avg humidity
Will County in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2  29° | 3 32° | 4 34° | 5  33° | 6  27° | 7  22° |
| 8  24° | 9 27° | 10 29° | 11 27° | 12 28° | 13 26° | 14 27° |
| 15 29° | 16  29° | 17 25° | 18 27° | 19  27° | 20 30° | 21 29° |
| 22 25° | 23 24° | 24 23° | 25 26° | 26  26° | 27 22° | 28 21° |
| 29 23° | 30 27° |
You can click on date
Access Will County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in Will County
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 28° /12° | 0 mm | 7 | |
| Sept. 2 | Mist | 29° /12° | 0 mm | 7 | |
| Sept. 3 | Fog | 32° /13° | 0 mm | 8 | |
| Sept. 4 | Mist | 34° /15° | 0 mm | 8 | |
| Sept. 5 | Cloudy | 33° /18° | 1.9 mm | 8 | |
| Sept. 6 | Patchy rain possible | 27° /15° | 2.4 mm | 6 | |
| Sept. 7 | Overcast | 22° /10° | 0 mm | 6 | |
| Sept. 8 | Partly cloudy | 24° /9° | 0 mm | 7 | |
| Sept. 9 | Mist | 27° /11° | 0 mm | 7 | |
| Sept. 10 | Partly cloudy | 29° /12° | 0 mm | 8 | |
| Sept. 11 | Light rain shower | 27° /15° | 16.6 mm | 7 | |
| Sept. 12 | Fog | 28° /13° | 0 mm | 7 | |
| Sept. 13 | Mist | 26° /13° | 0 mm | 6 | |
| Sept. 14 | Mist | 27° /12° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 29° /14° | 0 mm | 7 | |
| Sept. 16 | Thundery outbreaks possible | 29° /14° | 0.3 mm | 7 | |
| Sept. 17 | Light rain shower | 25° /13° | 2.7 mm | 6 | |
| Sept. 18 | Mist | 27° /10° | 0 mm | 6 | |
| Sept. 19 | Moderate rain | 27° /12° | 2.7 mm | 6 | |
| Sept. 20 | Fog | 30° /15° | 0 mm | 7 | |
| Sept. 21 | Patchy rain possible | 29° /14° | 1.5 mm | 7 | |
| Sept. 22 | Light rain shower | 25° /16° | 14.8 mm | 6 | |
| Sept. 23 | Mist | 24° /12° | 0 mm | 5 | |
| Sept. 24 | Mist | 23° /11° | 0 mm | 6 | |
| Sept. 25 | Fog | 26° /15° | 0.1 mm | 6 | |
| Sept. 26 | Moderate or heavy rain shower | 26° /13° | 14.3 mm | 6 | |
| Sept. 27 | Light rain shower | 22° /14° | 5 mm | 5 | |
| Sept. 28 | Fog | 21° /16° | 0 mm | 5 | |
| Sept. 29 | Fog | 23° /16° | 0 mm | 6 | |
| Sept. 30 | 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.
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 13°. 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 93.4 mm spread over approximately 10 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 17 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
Select a location for an accurate weather forecast
More Locations Quick links
You are here
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.
Found a mistake?
We appreciate your attention to details. Tell us here.