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

79°F

26°C

Humidity 82%
Wind Speed S 6 mph
Barometer 30.10 in (1018.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 8 Aug 12:56 am CDT
Extended Forecast for

4 Miles S Lockhart TX

  • Overnight

    Overnight: Mostly clear, with a low around 74. South wind around 5 mph becoming calm.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Southeast wind 5 to 10 mph becoming south southwest after midnight.

    Low: 76 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 98. Heat index values as high as 104. Light and variable wind becoming southeast 5 to 10 mph in the afternoon.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 97. Light south southeast wind increasing to 5 to 10 mph in the morning.

    High: 97 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 74. South wind around 5 mph becoming calm.
Saturday
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Southeast wind 5 to 10 mph becoming south southwest after midnight.
Sunday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 98. Heat index values as high as 104. Light and variable wind becoming southeast 5 to 10 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph.
Monday
Mostly sunny, with a high near 97. Light south southeast wind increasing to 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 99. South wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 76. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Sunny and hot, with a high near 100.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
Sunny and hot, with a high near 101.
Thursday Night
Mostly clear, with a low around 77.
Friday
Mostly sunny and hot, with a high near 100.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Lockhart TX
 29.82°N 97.68°W (Elev. 548 ft)
Last Update:
1:06 am CDT Aug 8, 2026
Forecast Valid:
1am CDT Aug 8, 2026-6pm CDT Aug 14, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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