Weather in DuPage County, Illinois for September 2025
Until now, September 2025 in DuPage County is cooler than usual, with temperatures averaging 24.3 °F, this is -2.4 °F below the typical seasonal average.
The forecast for the next days in DuPage County predicts temperatures to be around 24 °F, close to the historical average.
In general, the average temperature in DuPage County at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21.1 °F by the end of September.
DuPage County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 83.9 mm.
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DuPage County Weather September
Temperatures trend during September in DuPage County
September weather in DuPage County day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 27° /14° | 0 mm | 7 | |
| Sept. 2 | Sunny | 27° /14° | 0 mm | 6 | |
| Sept. 3 |  Overcast | 29° /14° | 17 mm | 7 | |
| Sept. 4 |  Mist | 28° /14° | 0 mm | 6 | |
| Sept. 5 | Overcast | 28° /16° | 0.7 mm | 6 | |
| Sept. 6 |  Patchy rain possible | 23° /12° | 3.3 mm | 5 | |
| Sept. 7 | Overcast | 21° /9° | 0 mm | 5 | |
| Sept. 8 | Overcast | 23° /9° | 0 mm | 5 | |
| Sept. 9 | Mist | 25° /11° | 0 mm | 6 | |
| Sept. 10 | Sunny | 28° /13° | 0 mm | 7 | |
| Sept. 11 | Light rain shower | 28° /16° | 14.1 mm | 7 | |
| Sept. 12 | Mist | 27° /13° | 0 mm | 6 | |
| Sept. 13 | Mist | 26° /16° | 0 mm | 6 | |
| Sept. 14 | Mist | 29° /16° | 0 mm | 7 | |
| Sept. 15 |  Cloudy | 30° /17° | 0 mm | 7 | |
| Sept. 16 | Sunny | 29° /16° | 0.4 mm | 7 | |
| Sept. 17 |  Light rain | 26° /15° | 1.8 mm | 6 | |
| Sept. 18 | Sunny | 33° /18° | 0 mm | 1.4 | |
| Sept. 19 | Patchy rain possible | 28° /19° | 0.2 mm | 0.9 | |
| Sept. 20 | Overcast | 27° /17° | 0 mm | 1.3 | |
| Sept. 21 |  Heavy rain | 24° /18° | 26.3 mm | 0.9 | |
| Sept. 22 |  Moderate rain | 28° /18° | 17.6 mm | 0 | |
| Sept. 23 | Patchy rain possible | 25° /18° | 3.5 mm | 5 | |
| Sept. 24 | Moderate rain | 19° /17° | 9.3 mm | 4 | |
| Sept. 25 | Patchy rain possible | 20° /13° | 0.5 mm | 4 | |
| Sept. 26 | Patchy rain possible | 21° /15° | 4.1 mm | 4 | |
| Sept. 27 | Sunny | 25° /14° | 0 mm | 5 | |
| Sept. 28 | Patchy rain possible | 27° /16° | 2.9 mm | 5 | |
| Sept. 29 | Sunny | 18° /12° | 0 mm | 5 | |
| Sept. 30 |  Partly cloudy | 18° /10° | 0 mm | 4 | |
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DuPage County in September - FAQ
September rainfall patterns in DuPage County
UV exposure in DuPage County during September
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Where is DuPage County?Get accurate weather forecasts for DuPage County, located at latitude 41.786 and longitude -88.147. Stay updated with localized weather information tailored for DuPage County.