Average Temperatures for Illinois in August

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Average temperatures for August 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 August temperatures in °F
High °F Low °F Place High °C Low °C
82 63 Aurora 28 17
81 62 Chicago Botanical Garden 27 17
82 66 Chicago Midway Airport 28 19
82 63 Chicago O'Hare Airport 28 17
83 67 Chicago University 28 19
82 61 Elgin 28 16
82 63 Joliet 28 17

Northern Illinois

Average August temperatures
High °F Low °F Place High °C Low °C
81 61 Antioch 27 16
81 61 DeKalb 27 16
81 61 Dixon 27 16
82 60 Freeport 28 15
84 63 Moline 29 17
82 61 Rockford 28 16
79 61 Waukegan 26 16

Central Illinois

Normal temperatures for August
High °F Low °F Place High °C Low °C
88 69 Alton 31 20
87 67 Cahokia 31 19
84 63 Danville 29 17
84 64 Peoria 29 18
85 64 Quincy 29 18
85 64 Springfield 29 18
84 63 Urbana 29 17

Southern Illinois

Average temperatures in August
High °F Low °F Place High °C Low °C
88 67 Cairo 31 19
85 64 Marion 30 18
86 65 Mt Vernon 30 18
Reference

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

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