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

69°F

21°C

Humidity 15%
Wind Speed Vrbl 6 mph
Barometer 30.25 in (1023.9 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 12 Mar 4:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 42. East northeast wind around 5 mph becoming calm.

    Low: 42 °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 51. South wind around 5 mph.

    Low: 51 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 92. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40. North wind around 20 mph, with gusts as high as 35 mph.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 58. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 37. Northeast wind 5 to 10 mph becoming light and variable after midnight.

    Low: 37 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 42. 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 51. South wind around 5 mph.
Saturday
Sunny, with a high near 84. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 92. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 40. North wind around 20 mph, with gusts as high as 35 mph.
Monday
Mostly sunny, with a high near 58. North wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 37. Northeast wind 5 to 10 mph becoming light and variable after midnight.
Tuesday
Mostly sunny, with a high near 68.
Tuesday Night
Partly cloudy, with a low around 47.
Wednesday
Mostly sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
Mostly sunny, 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:
5:32 pm CDT Mar 12, 2026
Forecast Valid:
5pm CDT Mar 12, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation