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.

Mostly Cloudy

82°F

28°C

Humidity 79%
Wind Speed S 12 mph
Barometer 29.96 in (1013.3 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 3 Sep 7:56 am CDT
Extended Forecast for

Lockhart TX

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny and hot, with a high near 101. Heat index values as high as 106. South southwest wind 5 to 10 mph.

    High: 101 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 76. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 96. Heat index values as high as 102. South wind around 5 mph.

    High: 96 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. East southeast wind 5 to 10 mph becoming light south after midnight. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 73. Southeast wind 5 to 10 mph becoming light south in the evening.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. Southeast wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Mostly Clear

  • Labor Day

    Labor Day: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny and hot, with a high near 101. Heat index values as high as 106. South southwest wind 5 to 10 mph.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 76. Southeast wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 96. Heat index values as high as 102. South wind around 5 mph.
Friday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 72. East southeast wind 5 to 10 mph becoming light south after midnight. Chance of precipitation is 30%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 73. Southeast wind 5 to 10 mph becoming light south in the evening.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 74. Southeast wind around 5 mph becoming calm in the evening.
Labor Day
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 97.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
8:12 am CDT Sep 3, 2026
Forecast Valid:
8am CDT Sep 3, 2026-6pm CDT Sep 9, 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