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.

Overcast

63°F

17°C

Humidity 90%
Wind Speed N 13 mph
Barometer 29.89 in (1011.4 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 11 Mar 5:56 am CDT
Extended Forecast for

San Marcos TX

  • Today

    Today: Showers and thunderstorms, mainly before 10am. High near 84. North wind 5 to 10 mph becoming west southwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 84 °F

    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 46. North wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 46 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 67. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 43. Northeast wind around 5 mph becoming calm.

    Low: 43 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 51. South wind around 5 mph.

    Low: 51 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 85. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 85 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 61. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 89. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Partly Sunny

Detailed Forecast

Today
Showers and thunderstorms, mainly before 10am. High near 84. North wind 5 to 10 mph becoming west southwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Mostly clear, with a low around 46. North wind 10 to 15 mph, with gusts as high as 30 mph.
Thursday
Sunny, with a high near 67. North wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Clear, with a low around 43. Northeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 78. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Clear, with a low around 51. South wind around 5 mph.
Saturday
Sunny, with a high near 85. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 61. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 89. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 49.
Monday
Partly sunny, with a high near 64.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
Partly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
6:45 am CDT Mar 11, 2026
Forecast Valid:
6am CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation