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

74°F

23°C

Humidity 88%
Wind Speed N 12 mph
Barometer 30.04 in (1016.5 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 4 Oct 2:56 am CDT
Extended Forecast for

Mountain City TX

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 69. North wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 69 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Mostly cloudy, with a high near 81. North northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 69. North wind around 10 mph, with gusts as high as 25 mph.

    Low: 69 °F

    Decreasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 85. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. North wind 5 to 10 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 86. North wind 5 to 10 mph.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. Northeast wind around 5 mph.

    High: 88 °F

    Sunny

  • Wednesday Night

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

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 69. North wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
A chance of showers before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm. Mostly cloudy, with a high near 81. North northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Sunday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 69. North wind around 10 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 85. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 64. North wind 5 to 10 mph.
Tuesday
Sunny, with a high near 86. North wind 5 to 10 mph.
Tuesday Night
Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 88. Northeast wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 65. East northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mountain City TX
 30.04°N 97.89°W (Elev. 837 ft)
Last Update:
2:46 am CDT Oct 4, 2026
Forecast Valid:
3am CDT Oct 4, 2026-6pm CDT Oct 10, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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