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

46°F

8°C

Humidity 54%
Wind Speed SW 8 mph
Barometer 30.21 in (1022.5 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 6 Feb 4:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 81. West wind around 5 mph becoming calm in the afternoon.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 49. Calm wind becoming north northwest around 5 mph after midnight.

    Low: 49 °F

    Clear

  • Saturday

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

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm after midnight.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 75. Calm wind becoming south around 5 mph in the morning.

    High: 75 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 55. South wind around 5 mph.

    Low: 55 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 76. South wind 5 to 10 mph.

    High: 76 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 59. South southeast wind around 5 mph.

    Low: 59 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers. Partly sunny, with a high near 76. South wind 5 to 10 mph.

    High: 76 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 81. West wind around 5 mph becoming calm in the afternoon.
Tonight
Clear, with a low around 49. Calm wind becoming north northwest around 5 mph after midnight.
Saturday
Sunny, with a high near 79. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 50. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Partly sunny, with a high near 75. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 55. South wind around 5 mph.
Monday
Partly sunny, with a high near 76. South wind 5 to 10 mph.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 59. South southeast wind around 5 mph.
Tuesday
A 50 percent chance of showers. Partly sunny, with a high near 76. South wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 55.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 77.
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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:
4:32 am CST Feb 6, 2026
Forecast Valid:
5am CST Feb 6, 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