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.

Partly Cloudy

85°F

29°C

Humidity 31%
Wind Speed NW 10 G 20 mph
Barometer 29.91 in (1012.0 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 11 Mar 2:56 pm CDT
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 45. North wind 15 to 20 mph, with gusts as high as 35 mph.

    Low: 45 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 66. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 43. East northeast wind around 5 mph becoming calm.

    Low: 43 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 50. South wind around 5 mph.

    Low: 50 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 83 °F

    Sunny

  • Saturday Night

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

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 90. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 45. North wind 15 to 20 mph, with gusts as high as 35 mph.
Thursday
Sunny, with a high near 66. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Clear, with a low around 43. East northeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 50. South wind around 5 mph.
Saturday
Sunny, with a high near 83. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 61. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 90. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 63.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Mostly sunny, with a high near 70.
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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:
2:44 pm CDT Mar 11, 2026
Forecast Valid:
3pm CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
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Additional Resources

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