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

71°F

22°C

Humidity 19%
Wind Speed Vrbl 6 mph
Barometer 30.26 in (1024.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 5 Feb 3:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 47. West southwest wind around 5 mph.

    Low: 47 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 80. West wind around 5 mph becoming calm in the afternoon.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 48. Calm wind becoming northwest around 5 mph after midnight.

    Low: 48 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 77. North wind around 5 mph becoming southeast in the afternoon.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 49. Southeast wind around 5 mph becoming calm after midnight.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 76. Calm wind becoming south around 5 mph in the morning.

    High: 76 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph.

    Low: 58 °F

    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 47. West southwest wind around 5 mph.
Friday
Sunny, with a high near 80. West wind around 5 mph becoming calm in the afternoon.
Friday Night
Clear, with a low around 48. Calm wind becoming northwest around 5 mph after midnight.
Saturday
Sunny, with a high near 77. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 49. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly cloudy, with a high near 76. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 54. South wind around 5 mph.
Monday
Mostly cloudy, with a high near 77. South wind 5 to 10 mph.
Monday Night
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 76.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 82.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Partly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
3:46 pm CST Feb 5, 2026
Forecast Valid:
4pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation