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

80°F

27°C

Humidity 74%
Wind Speed S 14 mph
Barometer 30.11 in (1018.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 13 Apr 11:56 am CDT
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 83 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 84 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 67 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 82 °F

    Cloudy then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Partly sunny, with a high near 88. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 88 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 88. South wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 88 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 83. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly cloudy, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 67. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 88. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 20 mph.
Friday
Mostly cloudy, with a high near 88. South wind 10 to 20 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 68.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Sunday
A 20 percent chance of showers. Mostly cloudy, with a high near 73.
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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:
12:44 pm CDT Apr 13, 2026
Forecast Valid:
12pm CDT Apr 13, 2026-6pm CDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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