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.

A Few Clouds

98°F

37°C

Humidity 33%
Wind Speed SE 12 mph
Barometer 29.90 in (1011.4 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index101°F (38°C)
Last update 8 Aug 6:56 pm CDT
Extended Forecast for

Mountain City TX

  • Tonight

    Tonight: Clear, with a low around 74. South wind around 5 mph.

    Low: 74 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 98. Heat index values as high as 104. South southwest wind around 5 mph becoming east southeast in the afternoon.

    High: 98 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. South wind 5 to 10 mph.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. Southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 73. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 73 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73. South wind around 5 mph.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 74. South wind around 5 mph.
Saturday
Sunny, with a high near 98. Heat index values as high as 104. South southwest wind around 5 mph becoming east southeast in the afternoon.
Saturday Night
Mostly clear, with a low around 73. South wind 5 to 10 mph.
Sunday
Sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 73. Southeast wind 5 to 10 mph becoming light south after midnight.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 73. Southeast wind around 5 mph becoming south southwest after midnight.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 73. South wind around 5 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
Sunny, with a high near 97.
Thursday Night
Partly cloudy, with a low around 75.
Friday
Mostly sunny, with a high near 97.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mountain City TX
 30.04°N 97.89°W (Elev. 837 ft)
Last Update:
6:44 pm CDT Aug 8, 2025
Forecast Valid:
7pm CDT Aug 8, 2025-6pm CDT Aug 15, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation