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 and Windy

66°F

19°C

Humidity 49%
Wind Speed N 28 G 35 mph
Barometer 30.25 in (1023.6 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 11 Mar 10:56 pm CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Clear, with a low around 45. North wind around 20 mph, with gusts as high as 30 mph.

    Low: 45 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 66. North wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 41. Calm wind becoming southwest around 5 mph.

    Low: 41 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 48. South wind around 5 mph.

    Low: 48 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 84. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 84 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 92. South southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph.

    High: 92 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 45. North wind around 20 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 66. North wind 5 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Clear, with a low around 41. Calm wind becoming southwest around 5 mph.
Friday
Sunny, with a high near 77. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 48. South wind around 5 mph.
Saturday
Sunny, with a high near 84. South wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 60. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 92. South southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 42. North northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
Partly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 37.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
11:32 pm CDT Mar 11, 2026
Forecast Valid:
11pm CDT Mar 11, 2026-6pm CDT Mar 18, 2026
 
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