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Charleston August Weather

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

Typical Charleston August Weather 1991–2020
Average daily high	85.9 °F
Average daily low	64.4 °F
Average monthly precipitation	2.8 inches
Average monthly snow	none
Daily chance of precipitation	25.9%
Daily chance of snow	0%

Charleston August Weather Records 1896–2024
Highest temperature	107 °F	August 5, 1918
Lowest temperature	39 °F	August 31, 1915
Highest daily low	83 °F	August 19, 1972
Lowest daily high	63 °F	August 29, 1917
Hottest average high temperature	94.5 °F	1947
Coldest average high temperature	76.7 °F	1915
Most daily precipitation	4.5 inches	August 29, 1951
Most monthly precipitation	10.4 inches	1981
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	86.6	65.6	101	49
August 2	86.5	65.5	100	46
August 3	86.4	65.3	103	47
August 4	86.3	65.2	104	45
August 5	86.2	65.0	107	46
August 6	86.1	64.9	104	46
August 7	86.0	64.8	104	49
August 8	86.0	64.7	106	50
August 9	86.0	64.6	106	49
August 10	86.0	64.5	100	50
August 11	86.0	64.5	100	49
August 12	85.9	64.5	102	45
August 13	86.0	64.5	99	45
August 14	86.1	64.5	99	45
August 15	86.1	64.5	101	48
August 16	86.0	64.5	99	47
August 17	85.9	64.5	102	49
August 18	85.7	64.4	105	47
August 19	85.6	64.2	102	49
August 20	85.6	64.1	103	47
August 21	85.6	64.0	103	43
August 22	85.6	63.8	103	46
August 23	85.5	63.7	100	44
August 24	85.4	63.5	103	43
August 25	85.2	63.3	99	44
August 26	85.1	63.2	102	46
August 27	85.0	63.0	98	45
August 28	84.9	62.8	99	45
August 29	84.9	62.6	99	42
August 30	84.8	62.4	100	42
August 31	84.6	62.1	100	39

Weather Station Details

Years	Station	Coordinates
1896–2024	Charleston	location