National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Partly Cloudy

76°F

24°C

Humidity 100%
Wind Speed SE 6 mph
Barometer 30.06 in (1017.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index75°F (24°C)
Last update 15 Jul 12:56 am CDT
Extended Forecast for

Mountain City TX

Flood Watch July 15, 01:48am until July 15, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 15, 01:48am until July 15, 01:00pm

    NOW until 1:00pm Tue

    Flood Watch

  • Overnight

    Low: 74 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 94 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 74. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 96. Heat index values as high as 103. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 96 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 71. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 71 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 95. South wind 5 to 10 mph.

    High: 95 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 73. Southeast wind around 5 mph.

    Low: 73 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 93. South southwest wind around 5 mph.

    High: 93 °F

    Mostly Sunny

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 74. South wind around 5 mph.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 94. Heat index values as high as 102. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Increasing clouds, with a low around 74. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 96. Heat index values as high as 103. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 71. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny, with a high near 95. South wind 5 to 10 mph.
Thursday Night
Partly cloudy, with a low around 73. Southeast wind around 5 mph.
Friday
Mostly sunny, with a high near 93. South southwest wind around 5 mph.
Friday Night
Partly cloudy, with a low around 73. Southeast wind around 5 mph.
Saturday
Mostly sunny, with a high near 95.
Saturday Night
Partly cloudy, with a low around 75.
Sunday
Mostly sunny, with a high near 96.
Sunday Night
Partly cloudy, with a low around 75.
Monday
Mostly sunny, with a high near 98.
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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:
1:42 am CDT Jul 15, 2025
Forecast Valid:
1am CDT Jul 15, 2025-6pm CDT Jul 21, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation