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

98°F

37°C

Humidity 31%
Wind Speed S 10 mph
Barometer 29.82 in (1009.0 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 3 Aug 6:56 pm CDT
Extended Forecast for

3 Miles WSW Staples TX

  • Tonight

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

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph.

    High: 99 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 98. South wind around 5 mph.

    High: 98 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77. Southeast wind 5 to 10 mph.

    Low: 77 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the morning.

    High: 97 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers before 1am. Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.

    Low: 76 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph.
Tuesday Night
Increasing clouds, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny and hot, with a high near 99. Heat index values as high as 107. South wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 76. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 98. South wind around 5 mph.
Thursday Night
Mostly clear, with a low around 77. Southeast wind 5 to 10 mph.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Calm wind becoming southeast around 5 mph in the morning.
Friday Night
A 20 percent chance of showers before 1am. Mostly clear, with a low around 76. Southeast wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 77.
Sunday
Mostly sunny, with a high near 96.
Sunday Night
Partly cloudy, with a low around 77.
Monday
Mostly sunny, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Staples TX
 29.77°N 97.88°W (Elev. 525 ft)
Last Update:
6:42 pm CDT Aug 3, 2026
Forecast Valid:
7pm CDT Aug 3, 2026-6pm CDT Aug 10, 2026
 
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Additional Resources

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