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.

Partly Cloudy and Breezy

87°F

31°C

Humidity 48%
Wind Speed S 23 G 28 mph
Barometer 29.96 in (1013.8 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 4 Mar 1:56 pm CST
Extended Forecast for

3 Miles WNW San Marcos TX

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 83. South southeast wind around 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South southeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    High: 84 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 66 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: Showers likely, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 59. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 59 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 72. Northeast wind 5 to 10 mph. Chance of precipitation is 80%.

    High: 72 °F

    Showers

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly before 3pm. Partly sunny, with a high near 83. South southeast wind around 15 mph, with gusts as high as 25 mph.
Tonight
A slight chance of showers and thunderstorms before midnight, then a slight chance of showers and thunderstorms after 3am. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and 3pm. Cloudy, then gradually becoming mostly sunny, with a high near 84. South southeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Thursday Night
A 30 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Friday
Showers likely, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Showers likely, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 59. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Sunday
Showers and possibly a thunderstorm. High near 72. Northeast wind 5 to 10 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Cloudy, with a low around 63.
Monday
A 50 percent chance of showers. Mostly cloudy, with a high near 82.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Tuesday
Showers likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW San Marcos TX
 29.9°N 97.97°W (Elev. 686 ft)
Last Update:
12:48 pm CST Mar 4, 2026
Forecast Valid:
2pm CST Mar 4, 2026-6pm CDT Mar 10, 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