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

What kind of weather does September bring to Decatur? Get all the weather information you need to plan your visit.

Temperatures

Experience perfect weather in Decatur during September, featuring high temperatures and moderate rainfall. Daytime temperatures generally peak at 26°C, but after sunset, they often decrease to around 14°C.

Precipitation

Decatur in September usually receives moderate rainfall, averaging around 91 mm for the month. Analyzing past climate data, one can expect approximately 9 days of rain.

Average sunshine

Enjoy a sunny month with about 248 hours of sunshine, providing a cheerful and lively atmosphere.

If you're inclined towards comfortable temperatures and drier conditions, September is a prime time to visit Decatur. August and September typically offer 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 Decatur climate page with graphs.

 

Decatur, monthly averages in September

Min Temperature 14°C  

Max Temperature 26°C  

Chance of Rain 30%  

Precipitation 91 mm  

Rainy days 9 days  

Humidity 72% *  

Sunshine 248 hours *  

Percentage Sunshine 66% *  

* Data from: Springfield, the United States of America (59 KM, 36 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 Decatur.

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.