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

66°F

19°C

Humidity 87%
Wind Speed Calm
Barometer 29.89 in (1011.4 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 18 Feb 4:56 am CST
Extended Forecast for

3 Miles WNW 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 62. South wind around 5 mph.

    Low: 62 °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 57. North northeast wind around 5 mph.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 78. North northeast wind around 5 mph becoming east southeast in the afternoon.

    High: 78 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 59. East southeast wind around 5 mph becoming west after midnight.

    Low: 59 °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 42. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °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 62. 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 57. North northeast wind around 5 mph.
Friday
Mostly cloudy, with a high near 78. North northeast wind around 5 mph becoming east southeast in the afternoon.
Friday Night
Mostly cloudy, with a low around 59. East southeast 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 42. North wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 39.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 39.
Tuesday
Mostly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW San Marcos TX
 29.9°N 97.97°W (Elev. 686 ft)
Last Update:
4:32 am CST Feb 18, 2026
Forecast Valid:
5am CST Feb 18, 2026-6pm CST Feb 24, 2026
 
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Additional Resources

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