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

81°F

27°C

Humidity 77%
Wind Speed W 8 mph
Barometer 30.10 in (1018.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 2 Aug 7:56 pm CDT
Extended Forecast for

Martindale TX

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind.

    High: 99 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. East wind around 5 mph becoming south southeast after midnight.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the morning.

    High: 97 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 96. Calm wind becoming east around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 73. East wind 5 to 10 mph becoming light and variable after midnight.

    Low: 73 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 74. Calm wind.
Sunday
Sunny and hot, with a high near 99. Heat index values as high as 107. Calm wind.
Sunday Night
Partly cloudy, with a low around 76. East wind around 5 mph becoming south southeast after midnight.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the morning.
Monday Night
Partly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming light south after midnight.
Tuesday
Sunny, with a high near 96. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 73. East wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 75. South wind around 5 mph.
Thursday
Sunny, with a high near 97.
Thursday Night
Mostly clear, with a low around 75.
Friday
Sunny, with a high near 98.
Friday Night
Mostly clear, with a low around 75.
Saturday
Sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Martindale TX
 29.84°N 97.83°W (Elev. 502 ft)
Last Update:
6:42 pm CDT Aug 2, 2025
Forecast Valid:
8pm CDT Aug 2, 2025-6pm CDT Aug 9, 2025
 
Forecast Discussion
 
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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