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 87%
Wind Speed NW 3 mph
Barometer 30.05 in (1017.0 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 5 Aug 3:56 am CDT
Extended Forecast for

San Marcos Municipal Airport TX

  • Today

    Today: Sunny, with a high near 96. Heat index values as high as 103. Calm wind becoming east around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 72. East wind 5 to 10 mph becoming light and variable after midnight.

    Low: 72 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 96 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 73. Southeast wind 5 to 10 mph becoming light south after midnight.

    Low: 73 °F

    Mostly Clear

  • Thursday

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

    High: 97 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74. Southeast wind around 5 mph.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the morning.

    High: 98 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. South wind around 5 mph.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 97. Southeast wind around 5 mph.

    High: 97 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 96. Heat index values as high as 103. Calm wind becoming east around 5 mph in the afternoon.
Tonight
Mostly clear, with a low around 72. East wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming southeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 73. Southeast wind 5 to 10 mph becoming light south after midnight.
Thursday
Sunny, with a high near 97. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 74. Southeast wind around 5 mph.
Friday
Sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 74. South wind around 5 mph.
Saturday
Sunny, with a high near 97. Southeast wind around 5 mph.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny, with a high near 97.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.86°W (Elev. 600 ft)
Last Update:
1:42 am CDT Aug 5, 2025
Forecast Valid:
4am CDT Aug 5, 2025-6pm CDT Aug 11, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation