Weather in Naperville in September
Naperville, United States averages a high of 23.5°C (74.3°F) and low of 14.5°C (58.1°F) in September, with 8 rain days and 9.6 hours of daily sunshine. Travel score: 84.2/100 (Excellent). The best time to visit Naperville is September.
High
24°C74°F
Low
15°C58°F
🌧️
8
rain days
☀️
9.6
hrs/day sunshine
💧
70%
humidity
84— Excellent
September in Naperville is warm and mostly dry — excellent conditions for exploring.
What are the average temperatures in Naperville?
How much does it rain in Naperville in September?
Naperville receives an average of 75.1mm of rainfall across 8 rainy days in September. The annual total is 962.5mm.
What should I pack for Naperville in September?
Essentials
👟
Comfortable walking shoes
Essential for exploring the city
👕
Light layers and t-shirts
Warm weather around 24°C
🧴
Sunscreen SPF 30+
10 hours of sunshine daily
🕶️
Sunglasses
Protect your eyes from bright sun
Traveling to United States in September?
Don't let a public holiday surprise you — restaurants, shops, and attractions may be closed.
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Data based on 1994–2024 averages · Last updated: 2024-12-31