National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

35°F

2°C

Humidity 78%
Wind Speed Calm
Barometer 30.21 in (1023.2 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 9 Dec 7:56 am CST
Extended Forecast for

San Marcos TX

Freeze Warning until December 9, 09:00am
Click here for hazard details and duration
...
  •  
    Freeze Warning until December 9, 09:00am

    NOW until 9:00am Tue

    Freeze Warning

  • Today

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 46. Southwest wind 5 to 10 mph.

    Low: 46 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 74. Southwest wind around 5 mph becoming north northeast in the afternoon.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 44. North wind around 5 mph.

    Low: 44 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 70. Calm wind becoming south around 5 mph in the afternoon.

    High: 70 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 52. South southwest wind around 5 mph.

    Low: 52 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 75. South southwest wind 5 to 10 mph.

    High: 75 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58. Southeast wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny, with a high near 67. Light west southwest wind becoming south southwest 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Clear, with a low around 46. Southwest wind 5 to 10 mph.
Wednesday
Sunny, with a high near 74. Southwest wind around 5 mph becoming north northeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 44. North wind around 5 mph.
Thursday
Sunny, with a high near 70. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 52. South southwest wind around 5 mph.
Friday
Partly sunny, with a high near 75. South southwest wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 58. Southeast wind around 5 mph.
Saturday
Partly sunny, with a high near 77. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
Mostly cloudy, with a high near 64.
Sunday Night
Mostly cloudy, with a low around 49.
Monday
A 20 percent chance of showers. Mostly cloudy, with a high near 63.
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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:
6:42 am CST Dec 9, 2025
Forecast Valid:
8am CST Dec 9, 2025-6pm CST Dec 15, 2025
 
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