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

89°F

32°C

Humidity 55%
Wind Speed S 16 mph
Barometer 29.94 in (1012.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 13 Aug 8:56 pm CDT
Extended Forecast for

3 Miles WSW Kyle TX

  • Tonight

    Tonight: Increasing clouds, with a low around 76. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly cloudy through mid morning, then becoming sunny, with a high near 98. Heat index values as high as 109. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 98 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 77. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 77 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Sunday

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

    High: 99 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. Southwest wind around 5 mph becoming south southeast in the afternoon.

    High: 100 °F

    Hot

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 76. South wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly cloudy through mid morning, then becoming sunny, with a high near 98. Heat index values as high as 109. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Increasing clouds, with a low around 77. South wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny and hot, with a high near 99. South southwest wind around 5 mph.
Sunday Night
Mostly clear, with a low around 74. South southeast wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 100. Southwest wind around 5 mph becoming south southeast in the afternoon.
Monday Night
Mostly clear, with a low around 75. South southeast wind around 5 mph.
Tuesday
Sunny and hot, with a high near 99.
Tuesday Night
Mostly clear, with a low around 76.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
Sunny and hot, with a high near 100.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Kyle TX
 29.97°N 97.92°W (Elev. 650 ft)
Last Update:
7:44 pm CDT Aug 13, 2026
Forecast Valid:
9pm CDT Aug 13, 2026-6pm CDT Aug 20, 2026
 
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