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

97°F

36°C

Humidity 42%
Wind Speed S 14 mph
Barometer 29.90 in (1011.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 4 Aug 5:56 pm CDT
Extended Forecast for

2 Miles NNE San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 107. South wind 5 to 10 mph.

    High: 98 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 98. Heat index values as high as 107. South wind around 5 mph.

    High: 98 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 96. Calm wind becoming south southeast around 5 mph in the morning.

    High: 96 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Southeast wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 96 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. Southeast wind around 5 mph.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South wind 5 to 10 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 107. South wind 5 to 10 mph.
Wednesday Night
Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 98. Heat index values as high as 107. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 96. Calm wind becoming south southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph.
Saturday
Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 95.
Sunday Night
Partly cloudy, with a low around 76.
Monday
Mostly sunny, with a high near 97.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 98.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE San Marcos TX
 29.9°N 97.91°W (Elev. 640 ft)
Last Update:
5:32 pm CDT Aug 4, 2026
Forecast Valid:
6pm CDT Aug 4, 2026-6pm CDT Aug 11, 2026
 
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Additional Resources

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