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Weather in Naperville, Illinois for September 2025

Your guide to Naperville weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Naperville is cooler than usual, with temperatures averaging 23.5 °F, this is -2.9 °F below the typical seasonal average.

  • The forecast for the next days in Naperville predicts temperatures to be around 27 °F, close to the historical average.

  • In general, the average temperature in Naperville at the beginning of September is 26.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 25.6 °F by the end of September.

    • Rain 🌧️

  • Naperville experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 83.9 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
26°/15°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
64 %
Avg humidity

Naperville Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
27°
2
Sunny
27°
3
Overcast
29°
4
Mist
28°
5
Overcast
28°
6
Patchy rain possible
23°
7
Overcast
21°
8
Overcast
23°
9
Mist
25°
10
Sunny
28°
11
Light rain shower
28°
12
Mist
27°
13
Mist
26°
14
Mist
29°
15
Cloudy
29°
16
Sunny
30°
17
Sunny
31°
18
Sunny
31°
19
Patchy rain possible
28°
20
Moderate rain
26°
21
Moderate rain
28°
22
Patchy rain possible
29°
23
Partly cloudy
25°
24
Sunny
28°
25
Sunny
24°
26
Sunny
20°
27
Sunny
24°
28
Sunny
27°
29
Sunny
29°
30
Fog
27°

Temperatures trend during September in Naperville

See the weather trend as well as the moving average line

September weather in Naperville day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Sunny
Sunny
 27° /14° 0 mm 7
Sept. 2 Sunny
Sunny
 27° /14° 0 mm 6
Sept. 3 Overcast
Overcast
 29° /14° 17 mm 7
Sept. 4 Mist
Mist
 28° /14° 0 mm 6
Sept. 5 Overcast
Overcast
 28° /16° 0.7 mm 6
Sept. 6 Patchy rain possible
Patchy rain possible
 23° /12° 3.3 mm 5
Sept. 7 Overcast
Overcast
 21° /9° 0 mm 5
Sept. 8 Overcast
Overcast
 23° /9° 0 mm 5
Sept. 9 Mist
Mist
 25° /11° 0 mm 6
Sept. 10 Sunny
Sunny
 28° /13° 0 mm 7
Sept. 11 Light rain shower
Light rain shower
 28° /16° 14.1 mm 7
Sept. 12 Mist
Mist
 27° /13° 0 mm 6
Sept. 13 Mist
Mist
 26° /16° 0 mm 6
Sept. 14 Mist
Mist
 29° /16° 0 mm 7
Sept. 15 Cloudy
Cloudy
 29° /15° 0 mm 7
Sept. 16 Sunny
Sunny
 30° /18° 0 mm 1.5
Sept. 17 Sunny
Sunny
 31° /16° 0 mm 1.5
Sept. 18 Sunny
Sunny
 31° /17° 0 mm 1.4
Sept. 19 Patchy rain possible
Patchy rain possible
 28° /19° 1 mm 1.2
Sept. 20 Moderate rain
Moderate rain
 26° /18° 9.2 mm 0
Sept. 21 Moderate rain
Moderate rain
 28° /18° 9.6 mm 5
Sept. 22 Patchy rain possible
Patchy rain possible
 29° /20° 3.4 mm 5
Sept. 23 Partly cloudy
Partly cloudy
 25° /18° 0.1 mm 6
Sept. 24 Sunny
Sunny
 28° /18° 0 mm 6
Sept. 25 Sunny
Sunny
 24° /15° 0 mm 5
Sept. 26 Sunny
Sunny
 20° /11° 0 mm 4
Sept. 27 Sunny
Sunny
 24° /11° 0 mm 5
Sept. 28 Sunny
Sunny
 27° /13° 0 mm 5
Sept. 29 Sunny
Sunny
 29° /14° 0 mm 6
Sept. 30 Fog
Fog
 27° /16° 0 mm 6
Next
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.
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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 ☀️

Quick links

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Location coordinates Where is Naperville?

Get accurate weather forecasts for Naperville, located at latitude 41.786 and longitude -88.147. Stay updated with localized weather information tailored for Naperville.

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