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

81°F

27°C

Humidity 34%
Wind Speed SW 14 mph
Barometer 30.14 in (1020.2 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 8 Feb 3:56 pm CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Partly cloudy, with a low around 53. Southwest wind around 5 mph.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 82. Southwest wind 5 to 10 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 57. South wind 5 to 10 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph becoming calm after midnight.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. East northeast wind around 5 mph becoming calm.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 53. Southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 82. Southwest wind 5 to 10 mph.
Monday Night
Increasing clouds, with a low around 57. South wind 5 to 10 mph.
Tuesday
Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 56. East northeast wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 82. Light south wind becoming south southwest 5 to 10 mph in the morning.
Thursday Night
Partly cloudy, with a low around 58. South wind around 5 mph.
Friday
Mostly sunny, with a high near 82.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 77.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
4:32 pm CST Feb 8, 2026
Forecast Valid:
4pm CST Feb 8, 2026-6pm CST Feb 15, 2026
 
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Additional Resources

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Chance of Precipitation