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.

A Few Clouds

76°F

24°C

Humidity 88%
Wind Speed NW 5 mph
Barometer 30.04 in (1016.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 28 Aug 6:56 am CDT
Extended Forecast for

Lockhart TX

  • Today

    Today: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 106. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 99 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 10pm. Mostly clear, with a low around 75. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 99. Calm wind becoming south southeast around 5 mph in the morning.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 99. Calm wind becoming south around 5 mph in the morning.

    High: 99 °F

    Hot

Detailed Forecast

Today
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 106. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 10pm. Mostly clear, with a low around 75. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Saturday
Sunny and hot, with a high near 99. Heat index values as high as 103. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 74. Southeast wind around 5 mph becoming south southwest after midnight.
Sunday
Sunny and hot, with a high near 99. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 74. Southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 99. Calm wind becoming south southeast around 5 mph in the morning.
Monday Night
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny and hot, with a high near 99. Calm wind becoming south around 5 mph in the morning.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
Mostly sunny and hot, with a high near 100.
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ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
6:42 am CDT Aug 28, 2026
Forecast Valid:
7am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation