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.

Fair

73°F

23°C

Humidity 50%
Wind Speed S 9 mph
Barometer 30.07 in (1017.8 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 16 Feb 12:56 pm CST
Extended Forecast for

San Marcos TX

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 77. South wind around 5 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Patchy fog between 7am and 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 60. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 20 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.

    High: 82 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61. South wind around 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

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

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. Southeast wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. East wind 5 to 10 mph becoming north in the morning.

    High: 80 °F

    Mostly Sunny

Detailed Forecast

Washington's Birthday
Sunny, with a high near 77. South wind around 5 mph.
Tonight
Increasing clouds, with a low around 54. South wind around 5 mph.
Tuesday
Patchy fog between 7am and 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Increasing clouds, with a low around 60. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 61. South wind around 5 mph.
Thursday
Partly sunny, with a high near 84. South southwest wind around 5 mph becoming north northeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 60. Southeast wind around 5 mph.
Friday
Mostly sunny, with a high near 80. East wind 5 to 10 mph becoming north in the morning.
Friday Night
Mostly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
Mostly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
12:44 pm CST Feb 16, 2026
Forecast Valid:
1pm CST Feb 16, 2026-6pm CST Feb 22, 2026
 
Forecast Discussion
 
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Additional Resources

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