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.

Partly Cloudy

75°F

24°C

Humidity 64%
Wind Speed S 10 mph
Barometer 29.75 in (1007.0 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 18 Feb 4:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 64. South wind 5 to 10 mph.

    Low: 64 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 84. South southwest wind around 5 mph becoming north northeast in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 59. East wind around 5 mph.

    Low: 59 °F

    Partly Cloudy
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 80. North northeast wind around 5 mph becoming east southeast in the morning.

    High: 80 °F

    Patchy Fog
    then Partly
    Sunny

  • Friday Night

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

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 78. North wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 44. North wind around 15 mph, with gusts as high as 25 mph.

    Low: 44 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 66. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 64. South wind 5 to 10 mph.
Thursday
Patchy fog before 10am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 84. South southwest wind around 5 mph becoming north northeast in the afternoon.
Thursday Night
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 59. East wind around 5 mph.
Friday
Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 80. North northeast wind around 5 mph becoming east southeast in the morning.
Friday Night
Mostly cloudy, with a low around 60. East southeast wind around 5 mph becoming north after midnight.
Saturday
Mostly sunny, with a high near 78. North wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 44. North wind around 15 mph, with gusts as high as 25 mph.
Sunday
Mostly sunny, with a high near 66. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 41. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 83.
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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 pm CST Feb 18, 2026
Forecast Valid:
5pm CST Feb 18, 2026-6pm CST Feb 25, 2026
 
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Additional Resources

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