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San Marcos May Weather

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

Typical San Marcos May Weather 1991–2020
Average daily high	86.3 °F
Average daily low	65.2 °F
Average monthly precipitation	4.7 inches
Average monthly snow	none
Daily chance of precipitation	25.2%
Daily chance of snow	0%

San Marcos May Weather Records 1893–2024
Highest temperature	106 °F	May 29, 1927
Lowest temperature	40 °F	May 1, 1908
Highest daily low	80 °F	May 9, 1927
Lowest daily high	54 °F	May 3, 2011
Hottest average high temperature	95.1 °F	1925
Coldest average high temperature	78.3 °F	1907
Most daily precipitation	7.4 inches	May 15, 1970
Most monthly precipitation	14.4 inches	1929
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
May 1	83.2	61.2	94	40
May 2	83.4	61.4	97	44
May 3	83.7	61.7	100	44
May 4	83.9	61.9	98	42
May 5	84.1	62.2	99	43
May 6	84.3	62.4	102	43
May 7	84.5	62.6	100	45
May 8	84.7	62.8	100	46
May 9	84.8	63.1	103	45
May 10	85.1	63.4	97	47
May 11	85.3	63.7	99	44
May 12	85.5	64.0	101	43
May 13	85.6	64.4	101	43
May 14	85.8	64.6	100	45
May 15	86.0	65.0	100	42
May 16	86.2	65.2	101	45
May 17	86.5	65.5	99	44
May 18	86.8	65.8	100	44
May 19	87.1	66.1	100	46
May 20	87.3	66.3	100	48
May 21	87.5	66.7	101	50
May 22	87.7	66.9	101	49
May 23	88.0	67.1	103	52
May 24	88.2	67.3	106	51
May 25	88.4	67.5	99	55
May 26	88.7	67.7	101	51
May 27	89.0	67.9	103	55
May 28	89.2	68.2	106	53
May 29	89.5	68.5	106	53
May 30	89.8	68.7	102	53
May 31	90.0	69.0	101	50

Weather Station Details

Years	Station	Coordinates
1893–2024	San Marcos	location