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

8°C

46°F

Humidity 71%
Wind Speed SW 11 km/h
Barometer 1018.2 mb (30.08 in)
Dewpoint 3°C (37°F)
Visibility 16 km
Wind Chill6°C (42°F)
Last update 13 Mar 5:56 am CDT
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 26. Southwest wind 10 to 20 km/h, with gusts as high as 30 km/h.

    High: 26 °C

    Sunny

  • Tonight

    Tonight: Clear, with a low around 11. South wind around 10 km/h.

    Low: 11 °C

    Clear

  • Saturday

    Saturday: Sunny, with a high near 29. South wind 10 to 20 km/h, with gusts as high as 35 km/h.

    High: 29 °C

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 17. South southeast wind 15 to 20 km/h, with gusts as high as 35 km/h.

    Low: 17 °C

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 32. South southwest wind 15 to 25 km/h, with gusts as high as 40 km/h.

    High: 32 °C

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 5. North wind 25 to 30 km/h increasing to 30 to 35 km/h in the evening. Winds could gust as high as 60 km/h.

    Low: 5 °C

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 14. North wind 25 to 30 km/h decreasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 50 km/h.

    High: 14 °C

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 2. North northeast wind 5 to 15 km/h becoming southeast after midnight.

    Low: 2 °C

    Mostly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 20. South southeast wind 5 to 10 km/h increasing to 10 to 15 km/h in the afternoon. Winds could gust as high as 30 km/h.

    High: 20 °C

    Sunny

Detailed Forecast

Today
Sunny, with a high near 26. Southwest wind 10 to 20 km/h, with gusts as high as 30 km/h.
Tonight
Clear, with a low around 11. South wind around 10 km/h.
Saturday
Sunny, with a high near 29. South wind 10 to 20 km/h, with gusts as high as 35 km/h.
Saturday Night
Increasing clouds, with a low around 17. South southeast wind 15 to 20 km/h, with gusts as high as 35 km/h.
Sunday
Partly sunny, with a high near 32. South southwest wind 15 to 25 km/h, with gusts as high as 40 km/h.
Sunday Night
Mostly clear, with a low around 5. North wind 25 to 30 km/h increasing to 30 to 35 km/h in the evening. Winds could gust as high as 60 km/h.
Monday
Mostly sunny, with a high near 14. North wind 25 to 30 km/h decreasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 50 km/h.
Monday Night
Mostly cloudy, with a low around 2. North northeast wind 5 to 15 km/h becoming southeast after midnight.
Tuesday
Sunny, with a high near 20. South southeast wind 5 to 10 km/h increasing to 10 to 15 km/h in the afternoon. Winds could gust as high as 30 km/h.
Tuesday Night
Partly cloudy, with a low around 7.
Wednesday
Mostly sunny, with a high near 26.
Wednesday Night
Mostly clear, with a low around 11.
Thursday
Mostly sunny, with a high near 28.
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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 m)
Last Update:
5:32 am CDT Mar 13, 2026
Forecast Valid:
6am CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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