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

78°F

26°C

Humidity 97%
Wind Speed SE 9 mph
Barometer 29.80 in (1008.0 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 18 May 2:56 am CDT
Extended Forecast for

Mountain City TX

  • Overnight

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

    Low: 75 °F

    Mostly Cloudy

  • Sunday

    Sunday: Widespread haze between 7am and 11am. Mostly cloudy, with a high near 95. Heat index values as high as 102. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 95 °F

    Haze then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 73. South wind around 15 mph, with gusts as high as 30 mph.

    Low: 73 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 96. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 96 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Isolated showers and thunderstorms before 1am. Partly cloudy, with a low around 72. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 72 °F

    Isolated
    T-storms

  • Tuesday

    Tuesday: Isolated showers and thunderstorms before 1pm. Mostly sunny, with a high near 96. South wind around 5 mph becoming north in the afternoon. Chance of precipitation is 20%.

    High: 96 °F

    Isolated
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67. Northeast wind around 5 mph.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 94. East wind 5 to 10 mph.

    High: 94 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 68. East wind 5 to 10 mph becoming south southeast after midnight.

    Low: 68 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. South southeast wind around 10 mph.
Sunday
Widespread haze between 7am and 11am. Mostly cloudy, with a high near 95. Heat index values as high as 102. South wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday Night
Mostly cloudy, with a low around 73. South wind around 15 mph, with gusts as high as 30 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 96. Heat index values as high as 105. South wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
Isolated showers and thunderstorms before 1am. Partly cloudy, with a low around 72. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tuesday
Isolated showers and thunderstorms before 1pm. Mostly sunny, with a high near 96. South wind around 5 mph becoming north in the afternoon. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 67. Northeast wind around 5 mph.
Wednesday
Partly sunny, with a high near 94. East wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 68. East wind 5 to 10 mph becoming south southeast after midnight.
Thursday
Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 65.
Friday
Sunny, with a high near 94.
Friday Night
Partly cloudy, with a low around 68.
Saturday
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:
2:48 am CDT May 18, 2025
Forecast Valid:
3am CDT May 18, 2025-6pm CDT May 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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