Currently: 84 °F. Sunny. (Weather station: San Marcos Municipal Airport, USA). See more current weatherAnnual Weather Averages Near San Marcos
Averages are for San Marcos Municipal Airport, which is 5 miles from San Marcos.
Based on weather reports collected during 1985–2015.
All Year Climate & Weather Averages in San Marcos
High Temp: 97 °F
Low Temp: 40 °F
Mean Temp: 69 °F
Precipitation: 0.73"
Humidity: 66%
Dew Point: 55 °F
Wind: 8 mph
Pressure: 30.02 "Hg
Visibility: 10 mi
January Climate & Weather Averages in San Marcos
High Temp: 63 °F
Low Temp: 40 °F
Mean Temp: 51 °F
Precipitation: 0.66"
Humidity: 65%
Dew Point: 38 °F
Wind: 9 mph
Pressure: 30.15 "Hg
Visibility: 10 mi
February Climate & Weather Averages in San Marcos
High Temp: 67 °F
Low Temp: 43 °F
Mean Temp: 55 °F
Precipitation: 0.67"
Humidity: 65%
Dew Point: 42 °F
Wind: 9 mph
Pressure: 30.09 "Hg
Visibility: 10 mi
March Climate & Weather Averages in San Marcos
High Temp: 74 °F
Low Temp: 50 °F
Mean Temp: 62 °F
Precipitation: 0.74"
Humidity: 64%
Dew Point: 48 °F
Wind: 10 mph
Pressure: 30.02 "Hg
Visibility: 10 mi
April Climate & Weather Averages in San Marcos
High Temp: 81 °F
Low Temp: 58 °F
Mean Temp: 69 °F
Precipitation: 0.69"
Humidity: 65%
Dew Point: 56 °F
Wind: 10 mph
Pressure: 29.95 "Hg
Visibility: 10 mi
May Climate & Weather Averages in San Marcos
High Temp: 87 °F
Low Temp: 66 °F
Mean Temp: 76 °F
Precipitation: 1.47"
Humidity: 71%
Dew Point: 65 °F
Wind: 9 mph
Pressure: 29.92 "Hg
Visibility: 10 mi
June Climate & Weather Averages in San Marcos
High Temp: 93 °F
Low Temp: 72 °F
Mean Temp: 82 °F
Precipitation: 1.24"
Humidity: 68%
Dew Point: 69 °F
Wind: 8 mph
Pressure: 29.92 "Hg
Visibility: 10 mi
July Climate & Weather Averages in San Marcos
High Temp: 95 °F
Low Temp: 74 °F
Mean Temp: 85 °F
Precipitation: 0.53"
Humidity: 66%
Dew Point: 70 °F
Wind: 8 mph
Pressure: 29.98 "Hg
Visibility: 10 mi
August Climate & Weather Averages in San Marcos
High Temp: 97 °F
Low Temp: 74 °F
Mean Temp: 85 °F
Precipitation: 0.32"
Humidity: 62%
Dew Point: 69 °F
Wind: 7 mph
Pressure: 29.97 "Hg
Visibility: 10 mi
September Climate & Weather Averages in San Marcos
High Temp: 92 °F
Low Temp: 69 °F
Mean Temp: 80 °F
Precipitation: 0.88"
Humidity: 66%
Dew Point: 65 °F
Wind: 7 mph
Pressure: 29.97 "Hg
Visibility: 10 mi
October Climate & Weather Averages in San Marcos
High Temp: 83 °F
Low Temp: 59 °F
Mean Temp: 71 °F
Precipitation: 0.68"
Humidity: 66%
Dew Point: 57 °F
Wind: 8 mph
Pressure: 30.03 "Hg
Visibility: 10 mi
November Climate & Weather Averages in San Marcos
High Temp: 72 °F
Low Temp: 49 °F
Mean Temp: 61 °F
Precipitation: 0.46"
Humidity: 67%
Dew Point: 48 °F
Wind: 8 mph
Pressure: 30.10 "Hg
Visibility: 10 mi
December Climate & Weather Averages in San Marcos
High Temp: 64 °F
Low Temp: 41 °F
Mean Temp: 53 °F
Precipitation: 0.43"
Humidity: 67%
Dew Point: 40 °F
Wind: 8 mph
Pressure: 30.13 "Hg
Visibility: 10 mi