Illinois August Weather

Illinois weather averages and all-time records in the month of August from 1991–2020 based on data made available by the NOAA.

State:

Month:

Illinois Cities

August weather averages for various places in Illinois, from 1991–2020.

City	Average (°F)		Record (°F)		Monthly (inches)
City	High	Low	High	Low	Precipitation
Aledo	82.2	61.2	106	38	3.9
Aurora	82.5	61.9	105	37	3.9
Belleville	88.7	65.4	105	39	3.9
Bloomington-Normal	84.2	61.4	105	38	3.8
Carbondale	87.4	64.6	113	41	3.3
Carlyle	86.3	66.1	106	43	3.4
Champaign	83.3	62.2	102	39	3.3
Charleston	85.9	64.4	107	39	2.8
Chicago	82.8	66.5	102	43	4.1
Danville	84.0	63.0	107	37	3.3
Decatur	84.8	64.8	106	35	3.5
Dixon	81.0	61.1	103	37	4.4
Du Quoin	86.8	65.4	113	43	3.3
Elgin	82.2	61.3	102	38	4.4
Elizabeth	81.3	57.8	102	37	4.0
Fairfield	87.7	64.3	108	43	3.5
Freeport	80.9	59.9	102	31	4.4
Galesburg	82.5	63.6	102	41	3.9
Geneseo	83.1	63.3	103	40	4.2
Hoopeston	83.4	62.4	106	36	3.9
Jacksonville	85.2	61.3	112	39	3.4
Joliet	82.2	62.8	102	39	4.0
Kankakee	83.3	62.5	107	39	3.2
Kewanee	81.6	60.4	103	38	3.8
Lincoln	83.9	61.1	106	36	3.5
Moline	83.7	62.7	105	40	4.0
Monmouth	83.9	62.1	105	38	4.0
Morris	82.8	62.9	107	34	4.2
Morrison	82.8	59.8	105	36	4.2
Mt. Vernon	85.3	64.7	111	42	3.5
Olney	86.4	64.1	109	41	3.0
Ottawa	82.8	62.0	107	33	3.8
Pana	85.9	62.7	108	41	3.1
Paris	83.9	63.4	107	39	3.5
Peoria	84.0	64.2	106	41	3.3
Quincy	84.5	64.5	111	42	3.9
Rantoul	85.2	61.5	102	38	3.8
Rockford	82.1	61.2	104	35	4.2
Springfield	85.0	63.9	108	43	3.4
Tuscola	84.5	63.2	104	41	2.9