National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Excessive Rainfall and Tropical Storm in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce considerable, potentially life-threatening, flooding across the lower Mississippi River Valley and central Great Lakes region through tonight. Tropical Storm Arthur will move northeastward along the Texas coast today and then move inland over southwestern Louisiana by tonight. An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

83°F

28°C

Humidity 77%
Wind Speed NE 5 mph
Barometer 29.75 in (1006.6 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 17 Jun 10:56 am CDT
Extended Forecast for

Lockhart TX

Extreme Heat Warning June 18, 12:00pm until June 18, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Today

    Today: Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph.

    High: 92 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 77. South southeast wind 5 to 10 mph.

    Low: 77 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Partly sunny, with a high near 97. Heat index values as high as 113. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 97 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 80. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 80 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 95. Southeast wind 5 to 10 mph.

    High: 95 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 78. South southeast wind 5 to 10 mph.

    Low: 78 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 92. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 92 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 77. South southeast wind around 10 mph.

    Low: 77 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 95. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 95 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 92. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph.
Tonight
Increasing clouds, with a low around 77. South southeast wind 5 to 10 mph.
Thursday
Partly sunny, with a high near 97. Heat index values as high as 113. South wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Increasing clouds, with a low around 80. South southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Juneteenth
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 95. Southeast wind 5 to 10 mph.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 78. South southeast wind 5 to 10 mph.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 92. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 77. South southeast wind around 10 mph.
Sunday
Mostly sunny, with a high near 95. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 78.
Monday
Mostly sunny, with a high near 97.
Monday Night
Partly cloudy, with a low around 77.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lockhart TX
 29.88°N 97.68°W (Elev. 525 ft)
Last Update:
8:44 am CDT Jun 17, 2026
Forecast Valid:
11am CDT Jun 17, 2026-6pm CDT Jun 23, 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