Average Temperatures for Illinois in April





Average temperatures for April 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 1991 to 2020 by the US National Centers for Environmental Information.

Chicago Area

Average April temperatures
High °F Low °F Place High °C Low °C
60 39 Aurora 15 4
57 38 Chicago Botanical Garden 14 3
60 42 Chicago Midway Airport 16 5
59 40 Chicago O'Hare Airport 15 5
59 37 Elgin 15 3
60 39 Joliet 16 4
59 37 Rochelle 15 3

Northern Illinois

Average temperatures in April
High °F Low °F Place High °C Low °C
56 37 Antioch 13 3
59 37 DeKalb 15 3
60 39 Dixon 16 4
58 36 Freeport 15 2
63 40 Moline 17 4
60 39 Rockford 15 4
56 36 Waukegan 13 2

Central Illinois

Normal temperatures for April
High °F Low °F Place High °C Low °C
66 45 Alton 19 7
62 39 Bloomington 17 4
68 46 Cahokia 20 8
63 42 Champaign 17 5
67 44 Charleston 20 7
65 42 Danville 18 6
63 43 Decatur 17 6
61 39 Kankakee 16 4
61 39 Ottawa 16 4
64 42 Peoria 18 6
64 43 Quincy 18 6
66 43 Springfield 19 6

Southern Illinois

Average April temperatures
High °F Low °F Place High °C Low °C
71 46 Belleville 21 8
70 48 Cairo 21 9
68 44 Carbondale 20 7
65 44 Mt Vernon 18 7
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Illinois Temperatures
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