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

24°C

76°F

Humidity 77%
Wind Speed SE 28 km/h
Barometer 1013.4 mb (29.95 in)
Dewpoint 20°C (68°F)
Visibility 16 km
Heat Index25°C (77°F)
Last update 16 Apr 9:56 pm CDT
Extended Forecast for

2 Miles WSW San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 20. South wind 15 to 20 km/h, with gusts as high as 30 km/h.

    Low: 20 °C

    Increasing
    Clouds

  • Friday

    Friday: Cloudy through mid morning, then gradual clearing, with a high near 32. South wind 15 to 20 km/h increasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 45 km/h.

    High: 32 °C

    Gradual
    Clearing

  • Friday Night

    Friday Night: Increasing clouds, with a low around 19. South southeast wind 20 to 25 km/h decreasing to 15 to 20 km/h after midnight. Winds could gust as high as 40 km/h.

    Low: 19 °C

    Increasing
    Clouds

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 24. South wind 10 to 15 km/h becoming north 20 to 25 km/h in the afternoon. Winds could gust as high as 40 km/h. Chance of precipitation is 60%.

    High: 24 °C

    Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 12. North northeast wind 25 to 30 km/h, with gusts as high as 50 km/h. Chance of precipitation is 60%.

    Low: 12 °C

    Showers
    Likely

  • Sunday

    Sunday: Partly sunny, with a high near 22. North northeast wind 20 to 25 km/h, with gusts as high as 40 km/h.

    High: 22 °C

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 13. East northeast wind 5 to 15 km/h.

    Low: 13 °C

    Mostly Cloudy

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 18. East northeast wind 10 to 15 km/h.

    High: 18 °C

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 14. East wind around 10 km/h.

    Low: 14 °C

    Chance
    Showers

Detailed Forecast

Tonight
Increasing clouds, with a low around 20. South wind 15 to 20 km/h, with gusts as high as 30 km/h.
Friday
Cloudy through mid morning, then gradual clearing, with a high near 32. South wind 15 to 20 km/h increasing to 20 to 25 km/h in the afternoon. Winds could gust as high as 45 km/h.
Friday Night
Increasing clouds, with a low around 19. South southeast wind 20 to 25 km/h decreasing to 15 to 20 km/h after midnight. Winds could gust as high as 40 km/h.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 24. South wind 10 to 15 km/h becoming north 20 to 25 km/h in the afternoon. Winds could gust as high as 40 km/h. Chance of precipitation is 60%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 12. North northeast wind 25 to 30 km/h, with gusts as high as 50 km/h. Chance of precipitation is 60%.
Sunday
Partly sunny, with a high near 22. North northeast wind 20 to 25 km/h, with gusts as high as 40 km/h.
Sunday Night
Mostly cloudy, with a low around 13. East northeast wind 5 to 15 km/h.
Monday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 18. East northeast wind 10 to 15 km/h.
Monday Night
A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 14. East wind around 10 km/h.
Tuesday
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 22.
Tuesday Night
Mostly cloudy, with a low around 17.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 27.
Wednesday Night
Mostly cloudy, with a low around 18.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 28.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 m)
Last Update:
6:44 pm CDT Apr 16, 2026
Forecast Valid:
10pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation