DuPage County (Naperville)
September
Weather in DuPage County, Illinois for September 2026
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 26.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.9 °C by the end of September.
The climate of DuPage County in September is notably wet, with an average of 11 rainy days, and a total of 102.7 mm of precipitation.
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Temperatures
Rain 🌧️
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19
Dry days
11
Rainy days
0
Snow days
26°/15°
Temperatures
16 km/h
Avg max wind
66 %
Avg humidity
DuPage County Weather September
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Temperatures trend during September in DuPage County
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September weather in DuPage County day by day
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| 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 | Fog | 28° /14° | 0 mm | 6 | |
| Sept. 19 | Light rain shower | 27° /15° | 8.3 mm | 6 | |
| Sept. 20 |  Thundery outbreaks possible | 27° /17° | 8.4 mm | 6 | |
| Sept. 21 | Patchy rain possible | 26° /17° | 4.4 mm | 6 | |
| Sept. 22 | Thundery outbreaks possible | 24° /16° | 17.5 mm | 5 | |
| Sept. 23 | Fog | 24° /15° | 9 mm | 5 | |
| Sept. 24 | Overcast | 22° /13° | 0 mm | 5 | |
| Sept. 25 | Fog | 25° /15° | 0.1 mm | 6 | |
| Sept. 26 | Fog | 27° /13° | 10.4 mm | 6 | |
| Sept. 27 | Light rain shower | 25° /14° | 7.2 mm | 6 | |
| Sept. 28 | Fog | 23° /16° | 0 mm | 5 | |
| Sept. 29 | Fog | 25° /15° | 0 mm | 6 | |
| Sept. 30 | Cloudy | 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.
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DuPage County in September - FAQ
What are the expected maximum and minimum temperatures in DuPage County during September?
During September, expect a variety of temperatures with highs around 26° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in DuPage County during September?
Significant rainfall exceeding 102.7 mm is expected in DuPage County during September, occurring over more than 11 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 💧
Typically, DuPage County has 11 rainy days in September with a total of 102.7 mm of rainfall.
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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