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

52°F

11°C

Humidity 75%
Wind Speed N 9 mph
Barometer 30.28 in (1025.3 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 6 Apr 4:56 am CDT
Extended Forecast for

3 Miles WSW San Marcos TX

  • Today

    Today: Sunny, with a high near 73. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 73 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 48. East northeast wind around 5 mph becoming calm in the evening.

    Low: 48 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 75. Calm wind becoming east southeast around 5 mph in the morning.

    High: 75 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming calm after midnight.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.

    High: 77 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61. South southeast wind around 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 81. Calm wind becoming southeast around 5 mph in the morning.

    High: 81 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.

    Low: 63 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. East southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Cloudy then
    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 73. Northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 48. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 75. Calm wind becoming east southeast around 5 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 55. East southeast wind around 5 mph becoming calm after midnight.
Wednesday
Partly sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 61. South southeast wind around 5 mph.
Thursday
Mostly cloudy, with a high near 81. Calm wind becoming southeast around 5 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 63. Southeast wind 5 to 10 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. East southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 65.
Saturday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 81.
Saturday Night
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 67.
Sunday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
2:48 am CDT Apr 6, 2026
Forecast Valid:
5am CDT Apr 6, 2026-6pm CDT Apr 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation