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Illinois United States of America
Precipitation in September
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September Rainfall Precipitation in Illinois

Illinois is a region in the United States of America. In September precipitation ranges from moderate in Freeport with 70 mm of rainfall to high in Roscoe with 124 mm of rainfall.

Where and how much does it rain in Illinois in September?

Find the average total precipitation in September for the most popular destinations in Illinois on the map below. Click on a destination dot for more detailed information.

Weather conditions Weather
Temperatures
Precipitation
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Legend heavy rainfall high moderate low almost none
Heavy rainfall has been defined as more than 160 mm precipitation. High: 90 mm to 160 mm. Moderate: 30 mm to 90 mm. Low: 5 mm to 30 mm.

  • How much rainfall does Illinois receive in September?
    • Chicago in September is characterized by an average rainfall of 95 mm, leading to a combination of both wet and sunny days.

  • What is the wettest city in September in Illinois?
    • Based on our records, Roscoe is the location with the highest average precipitation, receiving about 124 mm.

  • What is the driest city in September in Illinois?
    • The driest place is Freeport with an average precipitation of 70 mm according to our data.

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