Collinsville weather in September (Illinois, United States of America)

Wondering what the weather is like in Collinsville during September? Use this page to get an overview of the month’s weather conditions.

Temperatures

The weather in Collinsville during September is typically perfect, with high temperatures and moderate rainfall. The daytime often sees temperatures reaching 27°C, but nighttime brings a cool-down to 15°C.

Precipitation

Collinsville in September usually receives moderate rainfall, averaging around 96 mm for the month. The climate data from previous years indicates that there are typically about 9 days days of rain.

Average sunshine

With approximately 235 hours hours of sun, the days are filled with brightness. It makes it a perfect month for outdoor activities.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit. September and October generally stand out with the best circumstances. While January, February and December tend to showcase less optimal conditions.

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

 

Collinsville, monthly averages in September

Min Temperature 15°C  

Max Temperature 27°C  

Chance of Rain 30%  

Precipitation 96 mm  

Rainy days 9 days  

Humidity 71% *  

Sunshine 235 hours *  

Percentage Sunshine 63% *  

Data from: St. Louis, the United States of America (19 KM, 11 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?

It's going to be warm! Consider airy clothing, t-shirts, and other summer clothes. Shorts for men made of cotton or linen are good options for staying cool. However, there's a good chance of rain, so bring a raincoat just in case.

What To Do

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

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Interested in more climate information?

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

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.