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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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Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
67 %
Avg humidity

Naperville in September average weather

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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
Sunny
28° /14° 0 mm 7
Sept. 2 Sunny
Sunny
29° /14° 0 mm 7
Sept. 3 Overcast
Overcast
31° /14° 0 mm 8
Sept. 4 Mist
Mist
33° /17° 0 mm 8
Sept. 5 Overcast
Overcast
32° /19° 1.1 mm 8
Sept. 6 Patchy rain possible
Patchy rain possible
26° /16° 4.9 mm 6
Sept. 7 Overcast
Overcast
22° /11° 0 mm 6
Sept. 8 Overcast
Overcast
23° /10° 0 mm 6
Sept. 9 Mist
Mist
26° /12° 0 mm 7
Sept. 10 Sunny
Sunny
29° /13° 0 mm 7
Sept. 11 Light rain shower
Light rain shower
27° /15° 21.2 mm 7
Sept. 12 Mist
Mist
27° /13° 0 mm 7
Sept. 13 Mist
Mist
26° /15° 0 mm 6
Sept. 14 Mist
Mist
27° /14° 0 mm 7
Sept. 15 Cloudy
Cloudy
29° /15° 0 mm 7
Sept. 16 Thundery outbreaks possible
Thundery outbreaks possible
29° /15° 0.6 mm 7
Sept. 17 Light rain
Light rain
25° /15° 2.8 mm 6
Sept. 18 Fog
Fog
27° /12° 0 mm 6
Sept. 19 Light rain shower
Light rain shower
25° /14° 8.4 mm 6
Sept. 20 Thundery outbreaks possible
Thundery outbreaks possible
28° /16° 0.1 mm 6
Sept. 21 Patchy rain possible
Patchy rain possible
29° /16° 0.1 mm 7
Sept. 22 Thundery outbreaks possible
Thundery outbreaks possible
25° /16° 18.3 mm 6
Sept. 23 Fog
Fog
23° /13° 0 mm 5
Sept. 24 Fog
Fog
23° /12° 0 mm 6
Sept. 25 Fog
Fog
26° /15° 0.2 mm 6
Sept. 26 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
27° /14° 15.6 mm 6
Sept. 27 Light rain shower
Light rain shower
22° /15° 10.8 mm 5
Sept. 28 Fog
Fog
21° /16° 0 mm 5
Sept. 29 Fog
Fog
22° /16° 0 mm 5
Sept. 30 Fog
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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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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