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

65°F

18°C

Humidity 93%
Wind Speed SE 7 mph
Barometer 30.11 in (1018.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 9 Apr 5:56 am CDT
Extended Forecast for

3 Miles WSW San Marcos TX

  • Today

    Today: A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. East southeast wind 5 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 81 °F

    Cloudy then
    Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.

    Low: 65 °F

    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 80. East southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 80 °F

    Chance
    T-storms and
    Patchy Fog
    then Showers
    Likely

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. East southeast wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 82 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 69 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 7am. Mostly cloudy, with a high near 81. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 81 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Monday

    Monday: Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Cloudy

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. East southeast wind 5 to 10 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Southeast wind 5 to 10 mph. New rainfall amounts between a quarter and half of an inch possible.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 80. East southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, with a low around 66. East southeast wind 5 to 10 mph. Chance of precipitation is 20%.
Saturday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 82. Southeast wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
A slight chance of showers and thunderstorms between 1am and 4am, then a slight chance of showers after 4am. Mostly cloudy, with a low around 69. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 7am. Mostly cloudy, with a high near 81. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Sunday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 68. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, with a high near 83. South wind 10 to 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly cloudy, with a low around 69.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Tuesday Night
Mostly cloudy, with a low around 67.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW San Marcos TX
 29.86°N 97.97°W (Elev. 646 ft)
Last Update:
5:32 am CDT Apr 9, 2026
Forecast Valid:
6am CDT Apr 9, 2026-6pm CDT Apr 15, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation