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Chicago August Weather

Averages and records for weather in Chicago, Illinois in the month of August.

Typical Chicago August Weather 1991–2020
Average daily high	82.8 °F
Average daily low	66.5 °F
Average monthly precipitation	4.1 inches
Average monthly snow	none
Daily chance of precipitation	30.1%
Daily chance of snow	0%

Chicago August Weather Records 1901–2024
Highest temperature	102 °F	August 2, 1991
Lowest temperature	43 °F	August 29, 1965
Highest daily low	82 °F	August 6, 1918
Lowest daily high	58 °F	August 30, 1915
Hottest average high temperature	90.9 °F	1947
Coldest average high temperature	71.7 °F	1915
Most daily precipitation	4.5 inches	August 22, 2014
Most monthly precipitation	10.0 inches	1987
Most daily snow	none	-
Most monthly snow	none	-

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°F)		Record (°F)
Day	High	Low	High	Low
August 1	84.0	67.5	100	52
August 2	83.8	67.3	102	54
August 3	83.7	67.3	98	52
August 4	83.5	67.2	100	55
August 5	83.4	67.0	102	52
August 6	83.3	66.9	101	50
August 7	83.3	66.8	99	53
August 8	83.2	66.8	100	52
August 9	83.2	66.7	97	51
August 10	83.1	66.7	99	49
August 11	83.1	66.7	98	50
August 12	83.0	66.6	101	51
August 13	83.0	66.7	99	52
August 14	83.0	66.6	99	48
August 15	82.9	66.6	98	51
August 16	82.7	66.5	101	49
August 17	82.5	66.4	99	48
August 18	82.3	66.3	98	49
August 19	82.3	66.2	99	54
August 20	82.3	66.1	98	47
August 21	82.2	66.0	99	46
August 22	82.1	65.8	99	54
August 23	82.0	65.7	98	48
August 24	81.9	65.5	100	52
August 25	81.7	65.4	95	47
August 26	81.5	65.2	97	49
August 27	81.4	65.0	97	48
August 28	81.3	64.8	97	46
August 29	81.2	64.6	98	43
August 30	81.0	64.4	96	47
August 31	80.8	64.1	99	49

Weather Station Details

Years	Station	Coordinates
1944–2024	Chicago Midway Airport	location
1926–1943	University of Chicago	location
1901–1925	Fort Dearborn	location