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

98°F

37°C

Humidity 42%
Wind Speed SE 10 mph
Barometer 29.90 in (1011.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 4 Aug 4:56 pm CDT
Extended Forecast for

Mountain City TX

  • Tonight

    Tonight: A slight chance of showers between 7pm and 10pm. Mostly clear, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 97. Heat index values as high as 106. South wind 5 to 10 mph.

    High: 97 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy through mid morning, then gradual clearing, with a high near 97. Heat index values as high as 106. South wind around 5 mph.

    High: 97 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 75. Southeast wind 5 to 10 mph.

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95. South wind around 5 mph.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 95. Southeast wind around 5 mph.

    High: 95 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers between 7pm and 10pm. Mostly clear, with a low around 75. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 97. Heat index values as high as 106. South wind 5 to 10 mph.
Wednesday Night
Increasing clouds, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly cloudy through mid morning, then gradual clearing, with a high near 97. Heat index values as high as 106. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 75. Southeast wind 5 to 10 mph.
Friday
Sunny, with a high near 95. South wind around 5 mph.
Friday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 95. Southeast wind around 5 mph.
Saturday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Mostly sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Mostly sunny, with a high near 96.
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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:
5:32 pm CDT Aug 4, 2026
Forecast Valid:
5pm CDT Aug 4, 2026-6pm CDT Aug 11, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation