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.

Overcast

76°F

24°C

Humidity 100%
Wind Speed S 8 mph
Barometer 30.04 in (1016.7 mb)
Dewpoint 76°F (24°C)
Visibility 9.00 mi
Heat Index75°F (24°C)
Last update 14 Jul 4:56 am CDT
Extended Forecast for

Mountain City TX

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 73. South wind around 5 mph.

    Low: 73 °F

    Slight Chance
    Showers

  • Monday

    Monday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 92 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 93. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 93 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 93. South wind 5 to 10 mph.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 72. South southeast wind around 5 mph.

    Low: 72 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 73. South wind around 5 mph.
Monday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92. Heat index values as high as 102. South wind 5 to 10 mph. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 74. South southeast wind 5 to 10 mph.
Tuesday
Partly sunny, with a high near 93. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 93. South wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 72. South southeast wind around 5 mph.
Friday
Mostly sunny, with a high near 93.
Friday Night
Mostly cloudy, with a low around 74.
Saturday
Mostly sunny, with a high near 94.
Saturday Night
Partly cloudy, with a low around 74.
Sunday
Mostly sunny, with a high near 95.
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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:
5:32 am CDT Jul 14, 2025
Forecast Valid:
5am CDT Jul 14, 2025-6pm CDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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