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

78°F

26°C

Humidity 69%
Wind Speed S 9 mph
Barometer 29.98 in (1014.3 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 7 Mar 11:56 am CST
Extended Forecast for

2 Miles SSW Lockhart TX

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm before 3pm, then showers and thunderstorms likely after 3pm. Temperature falling to around 65 by 5pm. South wind 10 to 15 mph becoming north. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 78 °F⇓

    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 9pm. Mostly cloudy, with a low around 53. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 53 °F

    T-storms
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 72. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 72 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Cloudy, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Cloudy

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 83. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 66. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 66 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers. Cloudy, with a high near 83. South wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 83 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 61. South southeast wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.

    Low: 61 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A 40 percent chance of showers, mainly before noon. Sunny, with a high near 84. South southwest wind 10 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 84 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm before 3pm, then showers and thunderstorms likely after 3pm. Temperature falling to around 65 by 5pm. South wind 10 to 15 mph becoming north. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms likely, mainly before 9pm. Mostly cloudy, with a low around 53. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
A 40 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 72. North wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Cloudy, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 83. Light southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Monday Night
Mostly cloudy, with a low around 66. South southeast wind around 10 mph, with gusts as high as 20 mph.
Tuesday
A 30 percent chance of showers. Cloudy, with a high near 83. South wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 61. South southeast wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%.
Wednesday
A 40 percent chance of showers, mainly before noon. Sunny, with a high near 84. South southwest wind 10 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 25 mph.
Wednesday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 50.
Thursday
Sunny, with a high near 71.
Thursday Night
Clear, with a low around 46.
Friday
Sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Lockhart TX
 29.86°N 97.7°W (Elev. 545 ft)
Last Update:
12:24 pm CST Mar 7, 2026
Forecast Valid:
12pm CST Mar 7, 2026-6pm CDT Mar 13, 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