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

75°F

24°C

Humidity 82%
Wind Speed S 20 G 28 mph
Barometer 29.88 in (1011.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 6 Mar 8:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Cloudy, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 69 °F

    Cloudy

  • Saturday

    Saturday: A chance of showers, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind around 10 mph becoming northeast in the afternoon. 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: 83 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 56. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 56 °F

    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 69. North northeast wind 5 to 10 mph. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms. Cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after noon. Cloudy, with a high near 81. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after midnight. Cloudy, with a low around 68. South southeast wind around 10 mph.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly after midnight. Mostly cloudy, with a low around 64. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 64 °F

    T-storms
    Likely

Detailed Forecast

Tonight
Cloudy, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
A chance of showers, then showers and possibly a thunderstorm after noon. High near 83. South southeast wind around 10 mph becoming northeast in the afternoon. 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.
Saturday Night
Showers and possibly a thunderstorm. Low around 56. North wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy, with a high near 69. North northeast wind 5 to 10 mph. Chance of precipitation is 60%.
Sunday Night
A 20 percent chance of showers and thunderstorms. Cloudy, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.
Monday
A chance of showers, with thunderstorms also possible after noon. Cloudy, with a high near 81. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Monday Night
A 30 percent chance of showers and thunderstorms after midnight. Cloudy, with a low around 68. South southeast wind around 10 mph.
Tuesday
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
Showers and thunderstorms likely, mainly after midnight. Mostly cloudy, with a low around 64. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 79. Chance of precipitation is 40%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 55.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 70.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 77.
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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:
5:46 pm CST Mar 6, 2026
Forecast Valid:
9pm CST Mar 6, 2026-6pm CDT Mar 13, 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