Naperville (IL)
September
Weather in Naperville, Illinois for September 2026
Your guide to Naperville weather in September - trends and predictions
In general, the average temperature in Naperville 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 Naperville 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
Naperville Weather September
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Temperatures trend during September in Naperville
See the weather trend as well as the moving average line
September weather in Naperville 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 Naperville 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 Naperville forecast closer to your planned date for the most up-to-date weather information.
Change Month
Naperville in September - FAQ
What are the expected maximum and minimum temperatures in Naperville 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 Naperville during September?
Significant rainfall exceeding 102.7 mm is expected in Naperville during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Naperville during September?
The average wind speed in Naperville during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Naperville
Explore the daily rainfall trends and prepare for Napervilles September weather 💧
Typically, Naperville has 11 rainy days in September with a total of 102.7 mm of rainfall.
UV exposure in Naperville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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