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

54°F

12°C

Humidity 62%
Wind Speed SW 15 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 24 Feb 8:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 74. South southwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 53. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 58. South southwest wind 5 to 10 mph.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 54. North wind 5 to 10 mph.

    Low: 54 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 82. North northeast wind around 5 mph becoming east southeast in the afternoon.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 54. East southeast wind around 5 mph becoming calm.

    Low: 54 °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

Detailed Forecast

Today
Sunny, with a high near 74. South southwest wind 10 to 20 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 53. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 86. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 58. South southwest wind 5 to 10 mph.
Thursday
Sunny, with a high near 86. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Clear, with a low around 54. North wind 5 to 10 mph.
Friday
Sunny, with a high near 82. North northeast wind around 5 mph becoming east southeast in the afternoon.
Friday Night
Mostly clear, with a low around 54. East southeast wind around 5 mph becoming calm.
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 56.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
Partly cloudy, with a low around 58.
Monday
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 97.91°W (Elev. 597 ft)
Last Update:
5:44 am CST Feb 24, 2026
Forecast Valid:
9am CST Feb 24, 2026-6pm CST Mar 2, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation