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

71°F

22°C

Humidity 87%
Wind Speed SE 6 mph
Barometer 30.03 in (1016.0 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 4 Mar 5:56 am CST
Extended Forecast for

2 Miles W San Marcos Municipal Airport TX

  • Overnight

    Overnight: A slight chance of drizzle. Cloudy, with a low around 68. South wind around 10 mph.

    Low: 68 °F

    Slight Chance
    Drizzle

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after noon. Cloudy, then gradually becoming mostly sunny, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 84 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 9pm, then a slight chance of showers after 3am. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers, mainly before noon. Cloudy, then gradually becoming mostly sunny, with a high near 86. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 86 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 66 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 84. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 66 °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 around 10 mph becoming east northeast in the afternoon. Winds could gust 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 80%.

    Low: 59 °F

    Showers

Detailed Forecast

Overnight
A slight chance of drizzle. Cloudy, with a low around 68. South wind around 10 mph.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Cloudy, then gradually becoming mostly sunny, with a high near 84. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms before 9pm, then a slight chance of showers after 3am. Increasing clouds, with a low around 66. South southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Thursday
A 30 percent chance of showers, mainly before noon. Cloudy, then gradually becoming mostly sunny, with a high near 86. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Thursday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 66. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after noon. Mostly cloudy, with a high near 84. South wind 10 to 20 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 66. South southeast wind 10 to 15 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 around 10 mph becoming east northeast in the afternoon. Winds could gust 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 80%.
Sunday
Showers and possibly a thunderstorm. High near 75. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Monday
A 50 percent chance of showers. Mostly cloudy, with a high near 82.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 65.
Tuesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W San Marcos Municipal Airport TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
5:48 am CST Mar 4, 2026
Forecast Valid:
5am 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