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.

Partly Cloudy

79°F

26°C

Humidity 100%
Wind Speed SE 7 mph
Barometer 30.11 in (1019.0 mb)
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 27 Jul 7:56 am CDT
Extended Forecast for

Mountain City TX

  • Today

    Today: Partly sunny, with a high near 94. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming south around 5 mph in the morning.

    High: 95 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 72. South southeast wind around 5 mph.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 97. Southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 97 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 69. South southeast wind around 5 mph becoming southwest after midnight.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 98. West southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 98 °F

    Sunny

  • Wednesday Night

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

    Low: 73 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 97. Southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 97 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 94. Heat index values as high as 101. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming south around 5 mph in the morning.
Monday Night
Mostly clear, with a low around 72. South southeast wind around 5 mph.
Tuesday
Sunny, with a high near 97. Southwest wind around 5 mph becoming south southeast in the afternoon.
Tuesday Night
Mostly clear, with a low around 69. South southeast wind around 5 mph becoming southwest after midnight.
Wednesday
Sunny, with a high near 98. West southwest wind around 5 mph becoming south southeast in the afternoon.
Wednesday Night
Partly cloudy, with a low around 73. South southwest wind around 5 mph.
Thursday
Mostly sunny, with a high near 97. Southwest wind around 5 mph becoming south southeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 77.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 76.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mountain City TX
 30.02°N 97.92°W (Elev. 853 ft)
Last Update:
6:44 am CDT Jul 27, 2025
Forecast Valid:
8am CDT Jul 27, 2025-6pm CDT Aug 2, 2025
 
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Additional Resources

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Chance of Precipitation