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

78°F

26°C

Humidity 90%
Wind Speed SE 3 mph
Barometer 30.01 in (1015.2 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 31 Aug 4:56 am CDT
Extended Forecast for

2 Miles SSW Lockhart TX

  • Today

    Today: Mostly sunny and hot, with a high near 100. Heat index values as high as 104. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 74. East southeast wind 5 to 10 mph becoming light and variable after midnight.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74. East southeast wind around 5 mph becoming south after midnight.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 100. South southwest wind around 5 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 30%.

    Low: 74 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny and hot, with a high near 99. South wind around 5 mph. Chance of precipitation is 30%.

    High: 99 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 5 to 10 mph.

    Low: 74 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. Calm wind becoming southeast around 5 mph in the morning. Chance of precipitation is 20%.

    High: 98 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny and hot, with a high near 100. Heat index values as high as 104. Calm wind becoming southeast around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 74. East southeast wind 5 to 10 mph becoming light and variable after midnight.
Tuesday
Sunny and hot, with a high near 100. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 74. East southeast wind around 5 mph becoming south after midnight.
Wednesday
Mostly sunny and hot, with a high near 100. South southwest wind around 5 mph.
Wednesday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 30%.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny and hot, with a high near 99. South wind around 5 mph. Chance of precipitation is 30%.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. South wind 5 to 10 mph.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 98. Calm wind becoming southeast around 5 mph in the morning. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 73.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 97.
Saturday Night
Mostly clear, with a low around 73.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 98.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Lockhart TX
 29.86°N 97.7°W (Elev. 545 ft)
Last Update:
4:24 am CDT Aug 31, 2026
Forecast Valid:
5am CDT Aug 31, 2026-6pm CDT Sep 6, 2026
 
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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