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.

Fair

92°F

33°C

Humidity 52%
Wind Speed Vrbl 6 mph
Barometer 30.03 in (1015.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 1 Sep 11:56 am CDT
Extended Forecast for

Lockhart TX

  • This Afternoon

    This Afternoon: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. Heat index values as high as 104. Calm wind becoming east around 5 mph. Chance of precipitation is 10%.

    High: 98 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming calm after midnight.

    Low: 76 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 100 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. South wind 5 to 10 mph. Chance of precipitation is 10%.

    High: 98 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the morning. Chance of precipitation is 20%.

    High: 97 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. Heat index values as high as 104. Calm wind becoming east around 5 mph. Chance of precipitation is 10%.
Tonight
Partly cloudy, with a low around 76. East southeast wind around 5 mph becoming calm after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind 5 to 10 mph. Chance of precipitation is 30%.
Thursday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. South wind 5 to 10 mph. Chance of precipitation is 10%.
Thursday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southeast wind 5 to 10 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the morning. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph becoming light south after midnight.
Saturday
Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 74.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 97.
Sunday Night
Partly cloudy, with a low around 74.
Labor Day
Mostly sunny, with a high near 98.
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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:
11:42 am CDT Sep 1, 2026
Forecast Valid:
12pm CDT Sep 1, 2026-6pm CDT Sep 7, 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