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Charleston August Weather

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

Typical Charleston August Weather 1991–2020
Average daily high	89.8 °F
Average daily low	73.2 °F
Average monthly precipitation	7.0 inches
Average monthly snow	none
Daily chance of precipitation	42.3%
Daily chance of snow	0%

Charleston August Weather Records 1893–2024
Highest temperature	105 °F	August 1, 1999
Lowest temperature	56 °F	August 18, 1979
Highest daily low	83 °F	August 4, 2011
Lowest daily high	64 °F	August 29, 1986
Hottest average high temperature	94.3 °F	1954
Coldest average high temperature	84.2 °F	1922
Most daily precipitation	7.9 inches	August 11, 1940
Most monthly precipitation	17.2 inches	1940
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	90.9	74.0	105	64
August 2	90.9	73.9	99	63
August 3	90.8	73.9	98	60
August 4	90.8	73.9	100	65
August 5	90.8	73.9	100	63
August 6	90.7	73.9	100	62
August 7	90.7	73.8	99	59
August 8	90.6	73.8	99	59
August 9	90.5	73.7	98	62
August 10	90.4	73.7	99	61
August 11	90.3	73.6	98	58
August 12	90.1	73.4	98	62
August 13	90.0	73.4	100	61
August 14	89.9	73.3	102	61
August 15	89.9	73.3	99	63
August 16	89.8	73.3	99	65
August 17	89.8	73.2	102	62
August 18	89.8	73.2	101	56
August 19	89.7	73.1	98	61
August 20	89.6	73.0	99	63
August 21	89.4	72.9	100	62
August 22	89.3	72.8	100	63
August 23	89.1	72.7	99	62
August 24	89.0	72.6	98	61
August 25	88.9	72.4	96	60
August 26	88.7	72.3	97	60
August 27	88.6	72.2	99	61
August 28	88.5	72.0	98	60
August 29	88.4	71.9	97	57
August 30	88.3	71.7	96	59
August 31	88.2	71.6	97	61

Weather Station Details

Years	Station	Coordinates
1938–2024	Charleston International Airport	location
1893–1937	Charleston	location