Average Temperatures for Illinois in July





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

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

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.

Chicago Area

Average July temperatures
High °F Low °F Place High °C Low °C
84 65 Aurora 29 18
83 63 Chicago Botanical Garden 28 17
84 68 Chicago Midway Airport 29 20
84 64 Chicago O'Hare Airport 29 18
85 67 Chicago University 29 20
84 63 Elgin 29 17
84 64 Joliet 29 18

Northern Illinois

Average temperatures in July
High °F Low °F Place High °C Low °C
82 63 Antioch 28 17
83 63 DeKalb 29 17
83 63 Dixon 28 17
83 62 Freeport 29 17
86 65 Moline 30 18
85 63 Rockford 29 17
80 62 Waukegan 27 17

Central Illinois

Normal temperatures for July
High °F Low °F Place High °C Low °C
89 70 Alton 32 21
88 69 Cahokia 31 20
85 65 Danville 30 18
86 66 Peoria 30 19
86 66 Quincy 30 19
86 65 Springfield 30 19
85 65 Urbana 29 18

Southern Illinois

Average July temperature
High °F Low °F Place High °C Low °C
89 69 Cairo 32 20
86 66 Marion 30 19
86 67 Mt Vernon 30 19
Reference

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

Illinois Temperatures
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