Average Temperatures for Illinois in May

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Average temperatures for May 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 May temperatures
High °F Low °F Place High °C Low °C
71 50 Aurora 22 10
68 47 Chicago Botanical Garden 20   8
70 52 Chicago Midway Airport 21 11
70 48 Chicago O'Hare Airport 21   9
70 52 Chicago University 21 11
70 48 Elgin 21   9
71 49 Joliet 22   9

Northern Illinois

Average temperatures in May
High °F Low °F Place High °C Low °C
68 47 Antioch 20   9
70 49 DeKalb 21   9
71 49 Dixon 21   9
71 48 Freeport 22   9
73 51 Moline 23 10
72 48 Rockford 22   9
66 46 Waukegan 19   8

Central Illinois

Normal temperatures for May
High °F Low °F Place High °C Low °C
76 57 Alton 24 14
76 55 Cahokia 24 13
75 52 Danville 24 11
73 52 Peoria 23 11
73 53 Quincy 23 12
75 53 Springfield 24 11
73 52 Urbana 23 11

Southern Illinois

Average May temperature
High °F Low °F Place High °C Low °C
78 57 Cairo 26 14
75 53 Marion 24 12
74 54 Mt Vernon 23 12
Reference

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

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