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

59°F

15°C

Humidity 81%
Wind Speed N 16 mph
Barometer 30.00 in (1015.4 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 15 Feb 7:56 am CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Today

    Today: Sunny, with a high near 74. North wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 46. North wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 51. South wind around 5 mph.

    Low: 51 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 84. Southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 84 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 60. South southeast wind 5 to 10 mph.

    Low: 60 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 86. South southwest wind 5 to 10 mph.

    High: 86 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 74. North wind 10 to 20 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 46. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Increasing clouds, with a low around 51. South wind around 5 mph.
Tuesday
Mostly sunny, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 84. Southwest wind around 5 mph becoming south southeast in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 60. South southeast wind 5 to 10 mph.
Thursday
Partly sunny, with a high near 86. South southwest wind 5 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 58.
Friday
Mostly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 48.
Saturday
Partly sunny, with a high near 73.
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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:
5:42 am CST Feb 15, 2026
Forecast Valid:
8am CST Feb 15, 2026-6pm CST Feb 21, 2026
 
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