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

76°F

24°C

Humidity 35%
Wind Speed SW 6 mph
Barometer 29.65 in (1003.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 25 Feb 6:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 59. South wind 5 to 10 mph.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 89. Light and variable wind becoming north northeast 10 to 15 mph in the morning. Winds could gust as high as 20 mph.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 83. East wind around 5 mph.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 58. East wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 85 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 59. South southeast wind 5 to 10 mph.

    Low: 59 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 87. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 59. South wind 5 to 10 mph.
Thursday
Sunny, with a high near 89. Light and variable wind becoming north northeast 10 to 15 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Mostly clear, with a low around 59. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 83. East wind around 5 mph.
Friday Night
Mostly clear, with a low around 58. East wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 85. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 59. South southeast wind 5 to 10 mph.
Sunday
Mostly sunny, with a high near 87. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 61. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Partly sunny, with a high near 80.
Monday Night
Mostly cloudy, with a low around 60.
Tuesday
Mostly cloudy, with a high near 80.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Wednesday
A 30 percent chance of showers. Mostly cloudy, with a high near 81.
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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:
6:44 pm CST Feb 25, 2026
Forecast Valid:
7pm CST Feb 25, 2026-6pm CST Mar 4, 2026
 
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Additional Resources

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Chance of Precipitation