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

51°F

11°C

Humidity 80%
Wind Speed N 6 mph
Barometer 30.27 in (1024.6 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 19 Oct 7:56 am CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 80. Calm wind becoming east around 5 mph in the afternoon.

    High: 80 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 84. Calm wind becoming east northeast around 5 mph in the morning.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 57. East northeast wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. East northeast wind around 5 mph.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. East wind around 5 mph becoming calm.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 58. East wind around 5 mph becoming calm.

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Light and variable wind becoming southeast 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 88 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 80. Calm wind becoming east around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 57. Calm wind.
Tuesday
Sunny, with a high near 84. Calm wind becoming east northeast around 5 mph in the morning.
Tuesday Night
Clear, with a low around 57. East northeast wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 86. East northeast wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 59. East wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 88. Calm wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 58. East wind around 5 mph becoming calm.
Friday
Sunny, with a high near 88. Light and variable wind becoming southeast 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Partly cloudy, with a low around 62.
Sunday
Partly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.93°N 97.89°W (Elev. 627 ft)
Last Update:
6:42 am CDT Oct 19, 2026
Forecast Valid:
8am CDT Oct 19, 2026-6pm CDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation