Tropical Storm Arthur and Heavy Rainfall in the South; Severe Weather in the Midwest

An outbreak of severe thunderstorms is expected across portions of Illinois and Indiana tonight. Intense tornadoes, swaths of damaging gusts, and hail in excess of 2 inches in diameter possible. Tropical Storm Arthur will continue to produce strong winds across coastal Upper Texas and Louisiana tonight, as well as potentially life-threatening flooding across southern Louisiana into Mississippi. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

85°F

29°C

Humidity 77%
Wind Speed SE 6 mph
Barometer 29.62 in (1002.3 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 17 Jun 7:56 pm CDT
Extended Forecast for

Martindale TX

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

    Tonight: Mostly clear, with a low around 77. East southeast wind 5 to 10 mph becoming south after midnight.

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 112. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 95 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 79. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 79 °F

    Increasing
    Clouds

  • Juneteenth

    Juneteenth: Partly sunny, with a high near 92. Heat index values as high as 106. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 92 °F

    Partly Sunny

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am.  Mostly cloudy, with a low around 78. South southeast wind 5 to 10 mph.  Chance of precipitation is 30%.

    Low: 78 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly after 1pm.  Partly sunny, with a high near 92. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Saturday Night

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

    Low: 77 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 94 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77. South southeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 77. East southeast wind 5 to 10 mph becoming south after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 95. Heat index values as high as 112. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Increasing clouds, with a low around 79. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Juneteenth
Partly sunny, with a high near 92. Heat index values as high as 106. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 78. South southeast wind 5 to 10 mph. Chance of precipitation is 30%.
Saturday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 92. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77. South southeast wind around 10 mph.
Sunday
Partly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 77. South southeast wind around 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Mostly sunny, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 76.
Wednesday
Mostly sunny, with a high near 97.
Basemap Options
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ABOUT THIS FORECAST

 
Point Forecast:
Martindale TX
 29.86°N 97.83°W (Elev. 548 ft)
8:12 pm CDT Jun 17, 2026
8pm CDT Jun 17, 2026-6pm CDT Jun 24, 2026
 
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Additional Resources

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Hourly Weather Forecast

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