National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

67°F

19°C

Humidity 84%
Wind Speed W 3 mph
Barometer 29.90 in (1011.8 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 18 Feb 3:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Patchy fog before 10am. Otherwise, partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. South wind around 5 mph.

    Low: 63 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 84. South southwest wind around 5 mph becoming north in the afternoon.

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. North northeast wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 79. North northeast wind around 5 mph becoming east southeast in the afternoon.

    High: 79 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 60. East wind around 5 mph becoming west after midnight.

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 76. North wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 43. North wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 43 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 65. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 10am. Otherwise, partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.
Tonight
Mostly cloudy, with a low around 63. South wind around 5 mph.
Thursday
Partly sunny, with a high near 84. South southwest wind around 5 mph becoming north in the afternoon.
Thursday Night
Partly cloudy, with a low around 58. North northeast wind around 5 mph.
Friday
Mostly cloudy, with a high near 79. North northeast wind around 5 mph becoming east southeast in the afternoon.
Friday Night
Mostly cloudy, with a low around 60. East wind around 5 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 76. North wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 43. North wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 65. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Mostly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
4:32 am CST Feb 18, 2026
Forecast Valid:
4am CST Feb 18, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation