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

41°F

5°C

Humidity 57%
Wind Speed NW 6 mph
Barometer 30.61 in (1036.5 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 23 Feb 7:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 65. East northeast wind around 5 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. East wind around 5 mph becoming southwest after midnight.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 75. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 75 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Mostly Clear

  • Wednesday

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

    High: 85 °F

    Sunny

  • Wednesday Night

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

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 49. North wind 5 to 10 mph.

    Low: 49 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 79. North wind around 5 mph becoming southeast in the afternoon.

    High: 79 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 65. East northeast wind around 5 mph.
Tonight
Mostly clear, with a low around 37. East wind around 5 mph becoming southwest after midnight.
Tuesday
Sunny, with a high near 75. South southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Tuesday Night
Mostly clear, with a low around 54. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
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 5 to 10 mph.
Thursday
Sunny, with a high near 83. South southwest wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Thursday Night
Clear, with a low around 49. North wind 5 to 10 mph.
Friday
Sunny, with a high near 79. North wind around 5 mph becoming southeast in the afternoon.
Friday Night
Mostly clear, with a low around 51.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 56.
Sunday
Mostly 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:
5:42 am CST Feb 23, 2026
Forecast Valid:
8am CST Feb 23, 2026-6pm CST Mar 1, 2026
 
Forecast Discussion
 
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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