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

67°F

19°C

Humidity 84%
Wind Speed SE 9 mph
Barometer 30.02 in (1016.0 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 1 Mar 5:56 am CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Today

    Today: Cloudy through mid morning, then gradual clearing, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 84 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 82 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Increasing clouds, with a low around 61. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 85. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before noon. Partly sunny, with a high near 86. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Chance
    Showers then
    Mostly Sunny

Detailed Forecast

Today
Cloudy through mid morning, then gradual clearing, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Increasing clouds, with a low around 60. South wind 5 to 15 mph, with gusts as high as 25 mph.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
Increasing clouds, with a low around 61. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 87. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 65. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 85. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southeast wind around 10 mph, with gusts as high as 20 mph.
Thursday
A 30 percent chance of showers and thunderstorms before noon. Partly sunny, with a high near 86. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 64.
Friday
A 40 percent chance of showers. Mostly cloudy, with a high near 85.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 63.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
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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:
6:44 am CST Mar 1, 2026
Forecast Valid:
8am CST Mar 1, 2026-6pm CST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation