DuPage County (Naperville)
September
Weather in DuPage County for September 2025
Your guide to DuPage County weather in September - trends and predictions
In general, the average temperature in DuPage County at the beginning of September is 28.7 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 24 °F by the end of September.
DuPage County sees moderate rainfall in September, averaging 9 rainy days.
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21
Dry days
9
Rainy days
0
Snow days
27°/14°
Temperatures
16 km/h
Avg max wind
67 %
Avg humidity
DuPage County in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  28° | 2 29° | 3  31° | 4  33° | 5 32° | 6  26° | 7 22° |
| 8 23° | 9 26° | 10 29° | 11 27° | 12 27° | 13 26° | 14 27° |
| 15  29° | 16  29° | 17  25° | 18 27° | 19 25° | 20 28° | 21 29° |
| 22 25° | 23 23° | 24 23° | 25 26° | 26  27° | 27 22° | 28 21° |
| 29 22° | 30 27° |
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Temperatures trend during September in DuPage County
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Sunny | 28° /14° | 0 mm | 7 | |
| Sept. 2 | Sunny | 29° /14° | 0 mm | 7 | |
| Sept. 3 | Overcast | 31° /14° | 0 mm | 8 | |
| Sept. 4 | Mist | 33° /17° | 0 mm | 8 | |
| Sept. 5 | Overcast | 32° /19° | 1.1 mm | 8 | |
| Sept. 6 | Patchy rain possible | 26° /16° | 4.9 mm | 6 | |
| Sept. 7 | Overcast | 22° /11° | 0 mm | 6 | |
| Sept. 8 | Overcast | 23° /10° | 0 mm | 6 | |
| Sept. 9 | Mist | 26° /12° | 0 mm | 7 | |
| Sept. 10 | Sunny | 29° /13° | 0 mm | 7 | |
| Sept. 11 | Light rain shower | 27° /15° | 21.2 mm | 7 | |
| Sept. 12 | Mist | 27° /13° | 0 mm | 7 | |
| Sept. 13 | Mist | 26° /15° | 0 mm | 6 | |
| Sept. 14 | Mist | 27° /14° | 0 mm | 7 | |
| Sept. 15 | Cloudy | 29° /15° | 0 mm | 7 | |
| Sept. 16 | Thundery outbreaks possible | 29° /15° | 0.6 mm | 7 | |
| Sept. 17 | Light rain | 25° /15° | 2.8 mm | 6 | |
| Sept. 18 | Fog | 27° /12° | 0 mm | 6 | |
| Sept. 19 | Light rain shower | 25° /14° | 8.4 mm | 6 | |
| Sept. 20 | Thundery outbreaks possible | 28° /16° | 0.1 mm | 6 | |
| Sept. 21 | Patchy rain possible | 29° /16° | 0.1 mm | 7 | |
| Sept. 22 | Thundery outbreaks possible | 25° /16° | 18.3 mm | 6 | |
| Sept. 23 | Fog | 23° /13° | 0 mm | 5 | |
| Sept. 24 | Fog | 23° /12° | 0 mm | 6 | |
| Sept. 25 | Fog | 26° /15° | 0.2 mm | 6 | |
| Sept. 26 | Moderate or heavy rain with thunder | 27° /14° | 15.6 mm | 6 | |
| Sept. 27 | Light rain shower | 22° /15° | 10.8 mm | 5 | |
| Sept. 28 | Fog | 21° /16° | 0 mm | 5 | |
| Sept. 29 | Fog | 22° /16° | 0 mm | 5 | |
| Sept. 30 | Fog | 27° /16° | 0 mm | 6 | |
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Important Notice
Our weather forecast for DuPage 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 DuPage County forecast closer to your planned date for the most up-to-date weather information.
DuPage County in September - FAQ
What are the expected maximum and minimum temperatures in DuPage 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 DuPage County during September?
Significant rainfall exceeding 128.3 mm is expected in DuPage County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in DuPage County during September?
The average wind speed in DuPage County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in DuPage County
Explore the daily rainfall trends and prepare for DuPage Countys September weather 💧
UV exposure in DuPage County during September
Stay informed about UV levels for safe outdoor activities throughout the month of 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.
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