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

79°F

26°C

Humidity 85%
Wind Speed S 8 mph
Barometer 29.97 in (1014.2 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 13 Oct 12:56 am CDT
Extended Forecast for

Mountain City TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 75. South wind 5 to 10 mph.

    Low: 75 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 101. South wind around 10 mph, with gusts as high as 25 mph.

    High: 93 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 76. South southeast wind around 10 mph, with gusts as high as 25 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 92. Heat index values as high as 101. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68. South southeast wind 5 to 10 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 90. South southeast wind 5 to 10 mph.

    High: 90 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. East southeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 82. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 58. North wind 15 to 20 mph, with gusts as high as 35 mph.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. South wind 5 to 10 mph.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 101. South wind around 10 mph, with gusts as high as 25 mph.
Tuesday Night
Increasing clouds, with a low around 76. South southeast wind around 10 mph, with gusts as high as 25 mph.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 92. Heat index values as high as 101. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Partly cloudy, with a low around 68. South southeast wind 5 to 10 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 90. South southeast wind 5 to 10 mph.
Thursday Night
Mostly clear, with a low around 65. East southeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 82. North northeast wind 15 to 20 mph, with gusts as high as 35 mph.
Friday Night
Partly cloudy, with a low around 58. North wind 15 to 20 mph, with gusts as high as 35 mph.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
Partly cloudy, with a low around 55.
Sunday
Sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 58.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mountain City TX
 30.04°N 97.89°W (Elev. 837 ft)
Last Update:
12:44 am CDT Oct 13, 2026
Forecast Valid:
1am CDT Oct 13, 2026-6pm CDT Oct 19, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation