Average Temperatures for Illinois in September

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Average temperatures for September at cities throughout Illinois are listed below.

The tables give the normal maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center.

You can jump to a separate table for each region of the state: Chicago Area, Northern Illinois, Central Illinois and Southern Illinois.

Chicago Area

Average September temperatures
High °F Low °F Place High °C Low °C
75 55 Aurora 24 13
74 54 Chicago Botanical Garden 24 12
75 58 Chicago Midway Airport 24 14
75 54 Chicago O'Hare Airport 24 12
77 59 Chicago University 25 15
75 52 Elgin 24 11
76 55 Joliet 25 13

Northern Illinois

Average temperatures in September
High °F Low °F Place High °C Low °C
73 53 Antioch 23 12
75 52 DeKalb 24 11
75 51 Dixon 24 11
74 50 Freeport 24 10
77 54 Moline 25 12
75 52 Rockford 24 11
71 53 Waukegan 22 12

Central Illinois

Normal temperatures for September
High °F Low °F Place High °C Low °C
81 61 Alton 27 16
80 58 Cahokia 26 14
78 55 Danville 26 13
77 55 Peoria 25 13
77 56 Quincy 25 13
79 55 Springfield 26 13
78 54 Urbana 26 12

Southern Illinois

Average September temperatures
High °F Low °F Place High °C Low °C
81 59 Cairo 27 15
79 55 Marion 26 13
79 56 Mt Vernon 26 13
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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