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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Mountain City TX

  • Today

    Today: Mostly cloudy, with a high near 66. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Mostly Cloudy

  • Tonight

    Tonight: Partly cloudy, with a low around 53. North wind around 5 mph becoming west southwest after midnight.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 61. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 88. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 88 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 90. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 90 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 65 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 88. South wind around 10 mph, with gusts as high as 20 mph.

    High: 88 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Today
Mostly cloudy, with a high near 66. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 53. North wind around 5 mph becoming west southwest after midnight.
Sunday
Mostly sunny, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Increasing clouds, with a low around 61. South wind around 10 mph, with gusts as high as 20 mph.
Monday
Partly sunny, with a high near 88. South wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Partly sunny, with a high near 90. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind 10 to 20 mph, with gusts as high as 30 mph.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 88. South wind around 10 mph, with gusts as high as 20 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Thursday Night
Mostly cloudy, with a low around 63.
Friday
Mostly cloudy, with a high near 88.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mountain City TX
 30.04°N 97.89°W (Elev. 837 ft)
Last Update:
6:42 am CDT Mar 28, 2026
Forecast Valid:
7am CDT Mar 28, 2026-6pm CDT Apr 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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