Naperville Weather in September

September in Naperville sees daytime temperatures around 25°C (77°F) and lows of 12°C (54°F) at night. With around 87 mm (3.4 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Naperville in September

Expect around 9 days of rain based on historical data, with 87 mm (3.4 in) average. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Naperville in September

The perfect temperature in Naperville in September makes it a solid month to visit, with 25°C (77°F) during the day and 12°C (54°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 12°C (54°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Naperville in September

There are approximately 226 hours of sunshine this month, resulting in mostly clear days.

If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Naperville.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Naperville's climate page.

Naperville Temperature in September

Min Temperature 12°C (54°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 31%  

Precipitation 87 mm (3.4 in)  

Rainy days 9 days  

Humidity 71% *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

* Data from: Chicago, the United States of America (31 KM, 19 Miles).

What to Wear in Naperville in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Naperville in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Naperville's climate page.

More climate data for Naperville

Temperature Rainfall Sunshine Humidity

See the full Naperville climate overview or explore weather in the United States of America.