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San Marcos, TX weather and climate

Caldwell County, TX · population 68,920 · about 587 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at San Marcos's own coordinates.

The year at a glance

Sunny days
221
clear or partly cloudy, per year
Precipitation
34 in
per year
Wet days
97
rain or snow per year
Snowfall
0 in
per year
Hot days
117
above 90 °F
Freezing nights
20
at or below 32 °F
Humidity
68%
average relative
Average temperature
69 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080100JanMarMayJulSepNovDaily high, Jan: 62 °FDaily high, Feb: 67 °FDaily high, Mar: 73 °FDaily high, Apr: 80 °FDaily high, May: 86 °FDaily high, Jun: 92 °FDaily high, Jul: 96 °FDaily high, Aug: 97 °FDaily high, Sep: 91 °FDaily high, Oct: 82 °FDaily high, Nov: 71 °FDaily high, Dec: 64 °FDaily low, Jan: 39 °FDaily low, Feb: 42 °FDaily low, Mar: 49 °FDaily low, Apr: 56 °FDaily low, May: 65 °FDaily low, Jun: 72 °FDaily low, Jul: 73 °FDaily low, Aug: 74 °FDaily low, Sep: 69 °FDaily low, Oct: 58 °FDaily low, Nov: 48 °FDaily low, Dec: 41 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high626773808692969791827164
Daily low394249566572737469584841

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovSan Marcos, Jan: 2.5 inSan Marcos, Feb: 2.4 inSan Marcos, Mar: 3.0 inSan Marcos, Apr: 3.1 inSan Marcos, May: 4.3 inSan Marcos, Jun: 2.9 inSan Marcos, Jul: 1.8 inSan Marcos, Aug: 2.2 inSan Marcos, Sep: 2.9 inSan Marcos, Oct: 3.2 inSan Marcos, Nov: 2.7 inSan Marcos, Dec: 2.7 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
San Marcos2.52.43.03.14.32.91.82.22.93.22.72.7

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovSan Marcos, Jan: 16 daysSan Marcos, Feb: 14 daysSan Marcos, Mar: 15 daysSan Marcos, Apr: 16 daysSan Marcos, May: 16 daysSan Marcos, Jun: 21 daysSan Marcos, Jul: 23 daysSan Marcos, Aug: 24 daysSan Marcos, Sep: 21 daysSan Marcos, Oct: 22 daysSan Marcos, Nov: 18 daysSan Marcos, Dec: 16 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
San Marcos161415161621232421221816

Compare San Marcos with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Texas city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).