Naperville
September
Weather in Naperville 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 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
Naperville 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 Naperville
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 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.
Naperville in September - FAQ
What are the expected maximum and minimum temperatures in Naperville 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 Naperville during September?
Significant rainfall exceeding 128.3 mm is expected in Naperville during September, occurring over more than 9 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 💧
UV exposure in Naperville during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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