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.

Mostly Cloudy

86°F

30°C

Humidity 63%
Wind Speed S 7 mph
Barometer 30.08 in (1017.7 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 28 Jun 11:56 am CDT
Extended Forecast for

Mountain City TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 95. Heat index values as high as 100. South southeast wind 5 to 10 mph.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light south wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Widespread haze. Partly cloudy, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Haze

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Haze then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Widespread haze. Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 72 °F

    Haze

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Mostly sunny, with a high near 93. South wind around 5 mph.

    High: 93 °F

    Haze then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Widespread haze. Partly cloudy, with a low around 72. South wind 5 to 10 mph.

    Low: 72 °F

    Haze

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Partly sunny, with a high near 94. South southeast wind 5 to 10 mph.

    High: 94 °F

    Haze then
    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 95. Heat index values as high as 100. South southeast wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 73. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze after 1pm. Mostly sunny, with a high near 93. Heat index values as high as 102. Light south wind becoming south southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Widespread haze. Partly cloudy, with a low around 74. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Mostly sunny, with a high near 94. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Widespread haze. Partly cloudy, with a low around 72. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Mostly sunny, with a high near 93. South wind around 5 mph.
Tuesday Night
Widespread haze. Partly cloudy, with a low around 72. South wind 5 to 10 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Widespread haze. Partly sunny, with a high near 94. South southeast wind 5 to 10 mph.
Wednesday Night
Widespread haze before 1am. Mostly cloudy, with a low around 73.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Thursday Night
Mostly cloudy, with a low around 74.
Independence Day
Mostly sunny, with a high near 95.
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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:
12:02 pm CDT Jun 28, 2025
Forecast Valid:
12pm CDT Jun 28, 2025-6pm CDT Jul 4, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation