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Climate & Weather Averages in San Marcos, Texas, USA

Currently: 90 °F. Overcast. (Weather station: San Marcos Municipal Airport, USA). See more current weather

Annual 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 1992–2021.

All Year Climate & Weather Averages in San Marcos

High Temp: 97 °F

Low Temp: 40 °F

Mean Temp: 69 °F

Precipitation: 2.15"

Humidity: 68%

Dew Point: 56 °F

Wind: 16 mph

Pressure: 30.02 "Hg

Visibility: 9 mi

January Climate & Weather Averages in San Marcos

High Temp: 63 °F

Low Temp: 40 °F

Mean Temp: 52 °F

Precipitation: 1.96"

Humidity: 66%

Dew Point: 38 °F

Wind: 16 mph

Pressure: 30.14 "Hg

Visibility: 9 mi

February Climate & Weather Averages in San Marcos

High Temp: 67 °F

Low Temp: 44 °F

Mean Temp: 56 °F

Precipitation: 1.33"

Humidity: 67%

Dew Point: 42 °F

Wind: 18 mph

Pressure: 30.08 "Hg

Visibility: 9 mi

March Climate & Weather Averages in San Marcos

High Temp: 74 °F

Low Temp: 51 °F

Mean Temp: 62 °F

Precipitation: 2.18"

Humidity: 67%

Dew Point: 49 °F

Wind: 18 mph

Pressure: 30.03 "Hg

Visibility: 9 mi

April Climate & Weather Averages in San Marcos

High Temp: 81 °F

Low Temp: 58 °F

Mean Temp: 69 °F

Precipitation: 2.08"

Humidity: 67%

Dew Point: 56 °F

Wind: 18 mph

Pressure: 29.95 "Hg

Visibility: 9 mi

May Climate & Weather Averages in San Marcos

High Temp: 87 °F

Low Temp: 66 °F

Mean Temp: 76 °F

Precipitation: 3.50"

Humidity: 72%

Dew Point: 65 °F

Wind: 17 mph

Pressure: 29.93 "Hg

Visibility: 9 mi

June Climate & Weather Averages in San Marcos

High Temp: 92 °F

Low Temp: 72 °F

Mean Temp: 82 °F

Precipitation: 3.00"

Humidity: 70%

Dew Point: 70 °F

Wind: 15 mph

Pressure: 29.92 "Hg

Visibility: 10 mi

July Climate & Weather Averages in San Marcos

High Temp: 96 °F

Low Temp: 74 °F

Mean Temp: 85 °F

Precipitation: 1.53"

Humidity: 67%

Dew Point: 70 °F

Wind: 15 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: 1.79"

Humidity: 64%

Dew Point: 69 °F

Wind: 14 mph

Pressure: 29.96 "Hg

Visibility: 10 mi

September Climate & Weather Averages in San Marcos

High Temp: 92 °F

Low Temp: 69 °F

Mean Temp: 80 °F

Precipitation: 2.59"

Humidity: 67%

Dew Point: 66 °F

Wind: 13 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: 2.29"

Humidity: 68%

Dew Point: 58 °F

Wind: 14 mph

Pressure: 30.02 "Hg

Visibility: 10 mi

November Climate & Weather Averages in San Marcos

High Temp: 73 °F

Low Temp: 49 °F

Mean Temp: 61 °F

Precipitation: 2.06"

Humidity: 69%

Dew Point: 48 °F

Wind: 15 mph

Pressure: 30.11 "Hg

Visibility: 9 mi

December Climate & Weather Averages in San Marcos

High Temp: 65 °F

Low Temp: 41 °F

Mean Temp: 53 °F

Precipitation: 1.44"

Humidity: 68%

Dew Point: 41 °F

Wind: 15 mph

Pressure: 30.12 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthAugust (85 °F avg)
Coldest MonthJanuary (52 °F avg)
Wettest MonthMay (3.50" avg)
Windiest MonthMarch (18 mph avg)
Annual precip.25.77" (per year)

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