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

71°F

22°C

Humidity 96%
Wind Speed E 3 mph
Barometer 30.15 in (1020.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 16 Aug 4:56 am CDT
Extended Forecast for

5 Miles WSW Martindale TX

  • Today

    Today: Sunny and hot, with a high near 100. Heat index values as high as 103. Calm wind becoming south around 5 mph in the morning.

    High: 100 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny and hot, with a high near 99. Heat index values as high as 102. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. South southwest wind around 5 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 77. South southeast wind 5 to 10 mph.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny and hot, with a high near 100. South southwest wind 5 to 10 mph.

    High: 100 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Mostly Clear

  • Thursday

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

    High: 100 °F

    Hot

Detailed Forecast

Today
Sunny and hot, with a high near 100. Heat index values as high as 103. Calm wind becoming south around 5 mph in the morning.
Tonight
Mostly clear, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny and hot, with a high near 99. Heat index values as high as 102. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 77. South southeast wind 5 to 10 mph.
Tuesday
Sunny and hot, with a high near 99. South southwest wind around 5 mph.
Tuesday Night
Partly cloudy, with a low around 77. South southeast wind 5 to 10 mph.
Wednesday
Sunny and hot, with a high near 100. South southwest wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly sunny and hot, with a high near 100. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 77.
Friday
Sunny and hot, with a high near 100.
Friday Night
Mostly clear, with a low around 77.
Saturday
Mostly sunny and hot, with a high near 101.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WSW Martindale TX
 29.81°N 97.91°W (Elev. 581 ft)
Last Update:
5:32 am CDT Aug 16, 2026
Forecast Valid:
5am CDT Aug 16, 2026-6pm CDT Aug 22, 2026
 
Forecast Discussion
 
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Additional Resources

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