Naperville (IL)
September
Weather in Naperville, Illinois for September 2025
Your guide to Naperville weather in September - trends and predictions
In general, the average temperature in Naperville 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.
Naperville experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 83.9 mm.
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Temperatures
Rain 🌧️
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22
Dry days
8
Rainy days
0
Snow days
26°/15°
Temperatures
16 km/h
Avg max wind
64 %
Avg humidity
Naperville Weather September
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Temperatures trend during September in Naperville
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September weather in Naperville 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 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?
Moderate rainfall is anticipated in Naperville during September, with a total of 83.9 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
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 💧
UV exposure in Naperville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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