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San Marcos August Weather

Averages and records for weather in San Marcos, Texas in the month of August.

Typical San Marcos August Weather 1991–2020
Average daily high	97.1 °F
Average daily low	73.5 °F
Average monthly precipitation	2.4 inches
Average monthly snow	none
Daily chance of precipitation	15.4%
Daily chance of snow	0%

San Marcos August Weather Records 1893–2024
Highest temperature	111 °F	August 23, 1917
Lowest temperature	50 °F	August 29, 2010
Highest daily low	81 °F	August 31, 2020
Lowest daily high	70 °F	August 27, 1966
Hottest average high temperature	105.1 °F	1924
Coldest average high temperature	88.2 °F	1974
Most daily precipitation	5.4 inches	August 27, 2017
Most monthly precipitation	12.5 inches	2017
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	97.3	73.9	105	61
August 2	97.3	73.9	106	61
August 3	97.4	73.9	107	60
August 4	97.4	73.9	108	61
August 5	97.5	73.9	107	57
August 6	97.5	73.9	107	62
August 7	97.4	73.8	108	64
August 8	97.4	73.8	107	61
August 9	97.4	73.8	108	59
August 10	97.5	73.8	109	59
August 11	97.5	73.8	110	60
August 12	97.4	73.8	108	60
August 13	97.4	73.8	109	59
August 14	97.3	73.7	107	57
August 15	97.2	73.6	106	60
August 16	97.1	73.6	107	59
August 17	97.0	73.5	108	58
August 18	96.9	73.5	107	58
August 19	96.8	73.4	108	59
August 20	96.7	73.3	107	60
August 21	96.6	73.2	108	58
August 22	96.5	73.1	108	57
August 23	96.4	73.0	111	55
August 24	96.2	72.8	107	56
August 25	96.0	72.7	108	59
August 26	95.7	72.6	107	58
August 27	95.5	72.4	109	55
August 28	95.2	72.3	106	54
August 29	95.0	72.1	106	50
August 30	94.8	72.0	109	57
August 31	94.5	71.9	108	60

Weather Station Details

Years	Station	Coordinates
1893–2024	San Marcos	location