Saint Charles weather in September (Illinois, United States of America)

Wondering what the weather is like in Saint Charles during September? Want to know if this month is ideal for visiting? Our guide provides detailed weather information.

Temperatures

Experience perfect weather in Saint Charles during September, featuring high temperatures and moderate rainfall. During the day, temperatures can climb to about 24°C. At night, they may fall to a cooler 12°C.

Precipitation

Saint Charles in September usually receives moderate rainfall, averaging around 94 mm for the month. Based on our climate data of the past 30 years, about 9 days of rain are anticipated.

Average sunshine

With approximately 226 hours hours of sun, the days are filled with brightness. It makes it a perfect month for outdoor activities.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit Saint Charles. September typically offers the best circumstances. While January, February, March, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Saint Charles climate page with graphs.

 

Saint Charles, monthly averages in September

Min Temperature 12°C  

Max Temperature 24°C  

Chance of Rain 30%  

Precipitation 94 mm  

Rainy days 9 days  

Humidity 71% *  

Sunshine 226 hours *  

Percentage Sunshine 60% *  

* Data from: Chicago, the United States of America (34 KM, 21 Miles).

Where to go in the United States of America in September

Find out more about the weather in the United States of America and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Saint Charles, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

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

Interested in more climate information?

This site provides you with all the information you need about the climate in Saint Charles.

Our site offers climate and forecast data for every country in the world. Are you going to the United States of America? On this website you can find historical weather averages for many cities in the United States of America. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.