TODAY JUN24
TEMPERATURE82
HUMIDITY89
PRESSURE101590
WIND COND.160 5.4
  • 9476Tue
  • 9676Wed
  • 9675Thu
  • 9577Fri
  • 9476Sat
daynightWeather update from San Marcos, San Marcos Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in San Marcos for August is 85.1 degrees
  • The lowest monthly average temperature in San Marcos for January is 50.5 degrees
  • The most monthly precipitation in San Marcos occurs in April with 18.2 inches
  • The air quality index in San Marcos is 5% worse than the national average
  • The pollution index in San Marcos is 31% better than the national average

Compare San Marcos, TX Weather

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      San Marcos Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January40°F64°F50°F8.7"
      February44°F69°F55°F2.4"
      March52°F76°F62°F12.6"
      April59°F82°F69°F18.2"
      May65°F87°F75°F7.9"
      June72°F94°F82°F6.3"
      July74°F96°F84°F9.3"
      August74°F98°F85°F13.2"
      September69°F92°F79°F7.0"
      October59°F84°F70°F6.2"
      November50°F74°F61°F5.4"
      December43°F65°F52°F3.5"

      San Marcos air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexSan MarcosTexasNational
      Air quality index445242
      Pollution index1,877,9202,009,3002,726,193

      San Marcos air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality249
      Days with moderate air quality114
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      San Marcos air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.020%
      Carbon Tetrachloride0.002%
      Lead0.001%
      Mercury0.010%

      Average monthly San Marcos temperature with heat index

      San Marcos monthly precipitation with daily maximum

      San Marcos monthly snow depth with daily maximum

      San Marcos monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Buda, TX16,4844412.0%
      Lockhart, TX13,7824412.0%
      Uhland, TX1,4894412.0%
      Redwood, TX3,3494412.0%
      Mountain City, TX5364412.0%
      San Marcos, TX64,0534412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Cheyenne, WY64,0994314.0%
      South Hill, WA64,1043040.0%
      Bellevue, NE63,9704020.0%
      Youngstown, OH64,1524216.0%
      Lake Elsinore, CA64,2018978.0%
      San Marcos, TX64,0534412.0%
      Source: The San Marcos, TX weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.