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

49°F

9°C

Humidity 48%
Wind Speed NW 9 mph
Barometer 30.24 in (1023.7 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 7 Feb 7:56 am CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Today

    Today: Sunny, with a high near 81. North wind around 5 mph becoming southeast in the afternoon.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm after midnight.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 55. South wind around 5 mph.

    Low: 55 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 50 percent chance of showers. Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 56. South wind around 5 mph.

    Low: 56 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82. Southwest wind around 5 mph.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 81. North wind around 5 mph becoming southeast in the afternoon.
Tonight
Partly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 76. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Mostly cloudy, with a low around 55. South wind around 5 mph.
Monday
Partly sunny, with a high near 77. South wind 5 to 10 mph.
Monday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 58. South wind around 5 mph.
Tuesday
A 50 percent chance of showers. Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 56. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 82. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Partly sunny, with a high near 82.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 57.
Friday
A 30 percent chance of showers. Mostly sunny, with a high near 79.
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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:
7:13 am CST Feb 7, 2026
Forecast Valid:
8am CST Feb 7, 2026-6pm CST Feb 13, 2026
 
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Additional Resources

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Chance of Precipitation