Weather in Will County, Illinois for September 2026
Flood Watch - See hour by hour.
So far, September 2026 in Will County is slightly warmer than the historical average by 1.2 °F.
Expect cooler weather in the next days in Will County with the forecast suggesting a temperature of 17.9 °F, lower than the historical average.
In general, the average temperature in Will County at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °F by the end of September.
The climate of Will County in September is notably wet, with an average of 12 rainy days, and a total of 86 mm of precipitation.
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Will County Weather September
Temperatures trend during September in Will County
September weather in Will County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 29° /14° | 3.9 mm | 6 | |
| Sept. 2 | Sunny | 30° /15° | 0 mm | 7 | |
| Sept. 3 | Sunny | 31° /15° | 7.5 mm | 7 | |
| Sept. 4 |  Mist | 31° /15° | 0 mm | 7 | |
| Sept. 5 | Sunny | 30° /17° | 0.9 mm | 7 | |
| Sept. 6 |  Patchy rain possible | 26° /13° | 1.3 mm | 6 | |
| Sept. 7 | Sunny | 24° /10° | 0 mm | 6 | |
| Sept. 8 |  Partly cloudy | 25° /10° | 0 mm | 6 | |
| Sept. 9 | Mist | 26° /12° | 34.4 mm | 5 | |
| Sept. 10 | Partly cloudy | 28° /13° | 0.4 mm | 6 | |
| Sept. 11 | Light rain shower | 28° /15° | 8.3 mm | 7 | |
| Sept. 12 | Fog | 28° /13° | 0 mm | 7 | |
| Sept. 13 | Mist | 26° /14° | 0 mm | 6 | |
| Sept. 14 | Mist | 27° /13° | 0 mm | 7 | |
| Sept. 15 |  Cloudy | 30° /16° | 2.2 mm | 6 | |
| Sept. 16 | Sunny | 28° /15° | 2.3 mm | 6 | |
| Sept. 17 | Light rain shower | 27° /14° | 5 mm | 5 | |
| Sept. 18 | Mist | 27° /12° | 0.8 mm | 6 | |
| Sept. 19 |  Moderate rain | 26° /14° | 9.2 mm | 5 | |
| Sept. 20 | Light rain shower | 21° /15° | 28.7 mm | 0.6 | |
| Sept. 21 |  Overcast | 17° /14° | 0 mm | 3.4 | |
| Sept. 22 | Overcast | 16° /13° | 0 mm | 2.2 | |
| Sept. 23 | Overcast | 17° /13° | 0.1 mm | 2.8 | |
| Sept. 24 | Overcast | 20° /14° | 0 mm | 5.5 | |
| Sept. 25 | Overcast | 20° /12° | 0 mm | 5 | |
| Sept. 26 | Overcast | 15° /15° | 0 mm | 4 | |
| Sept. 27 | Overcast | 21° /14° | 0 mm | 6 | |
| Sept. 28 | Sunny | 22° /13° | 0 mm | 6 | |
| Sept. 29 | Sunny | 22° /11° | 0 mm | 6 | |
| Sept. 30 | Overcast | 18° /13° | 3 mm | 4 | |
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Will County in September - FAQ
What are the expected maximum and minimum temperatures in Will County during September?
How much rainfall should be expected in Will County during September?
What are the typical wind conditions in Will County during September?
September rainfall patterns in Will County
UV exposure in Will County during September
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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.