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St. Charles August Weather

Averages and records for weather in St. Charles, Missouri in the month of August.

Typical St. Charles August Weather 1991–2020
Average daily high	86.4 °F
Average daily low	65.2 °F
Average monthly precipitation	3.8 inches
Average monthly snow	none
Daily chance of precipitation	23.6%
Daily chance of snow	0%

St. Charles August Weather Records 1893–2024
Highest temperature	112 °F	August 9, 1934
Lowest temperature	43 °F	August 30, 1986
Highest daily low	85 °F	August 26, 1909
Lowest daily high	63 °F	August 20, 1915
Hottest average high temperature	100.2 °F	1936
Coldest average high temperature	79.0 °F	1915
Most daily precipitation	5.9 inches	August 20, 1915
Most monthly precipitation	13.6 inches	1946
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	87.2	67.0	103	50
August 2	87.0	66.8	108	52
August 3	86.9	66.6	106	50
August 4	86.8	66.5	109	49
August 5	86.8	66.4	107	50
August 6	86.6	66.2	105	51
August 7	86.5	66.1	107	51
August 8	86.5	65.9	111	52
August 9	86.5	65.8	112	52
August 10	86.4	65.7	109	51
August 11	86.4	65.5	106	54
August 12	86.4	65.5	108	47
August 13	86.4	65.5	108	49
August 14	86.4	65.5	105	49
August 15	86.6	65.5	110	50
August 16	86.5	65.4	108	51
August 17	86.4	65.3	108	51
August 18	86.2	65.2	110	50
August 19	86.0	65.0	111	52
August 20	85.9	64.8	107	50
August 21	85.9	64.7	106	48
August 22	85.9	64.5	107	53
August 23	85.8	64.3	106	51
August 24	85.7	64.2	106	50
August 25	85.6	64.0	103	47
August 26	85.3	63.8	108	49
August 27	85.2	63.6	105	49
August 28	85.1	63.4	103	43
August 29	85.0	63.1	101	43
August 30	84.9	63.0	107	43
August 31	84.8	62.8	102	45

Weather Station Details

Years	Station	Coordinates
1893–2024	St. Charles Elm Point	location