Average April Temperatures for Illinois

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

Average Temperatures for Illinois in April

Chicago Area

Northern Illinois

Central Illinois

Southern Illinois

Reference

More Illinois Weather Information