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

45°F

7°C

Humidity 54%
Wind Speed N 14 mph
Barometer 30.62 in (1037.0 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 22 Feb 7:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 63. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 63 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 34. North wind 5 to 10 mph.

    Low: 34 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 65. North wind around 5 mph becoming southeast in the afternoon.

    High: 65 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 39. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 39 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 74. South southwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 74 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 55. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 55 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

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

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. South southwest wind around 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 83 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 63. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 34. North wind 5 to 10 mph.
Monday
Sunny, with a high near 65. North wind around 5 mph becoming southeast in the afternoon.
Monday Night
Clear, with a low around 39. Southeast wind around 5 mph becoming south southwest after midnight.
Tuesday
Sunny, with a high near 74. South southwest wind 5 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Mostly clear, with a low around 55. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly sunny, with a high near 85. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Mostly clear, with a low around 58. South wind around 10 mph.
Thursday
Sunny, with a high near 83. South southwest wind around 10 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Clear, with a low around 50.
Friday
Sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 56.
Saturday
Mostly sunny, with a high near 85.
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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:
5:42 am CST Feb 22, 2026
Forecast Valid:
8am CST Feb 22, 2026-6pm CST Feb 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation