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

72°F

22°C

Humidity 73%
Wind Speed S 14 mph
Barometer 30.05 in (1017.1 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 24 Mar 10:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 64. South wind 5 to 10 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 88 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 64. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy through mid morning, then gradual clearing, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Becoming
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. South wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 89. South wind 5 to 10 mph becoming east southeast in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 60. North northeast wind around 10 mph.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 82. East northeast wind around 10 mph.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54. East northeast wind around 5 mph becoming southeast after midnight.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 64. South wind 5 to 10 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Increasing clouds, with a low around 64. South wind around 10 mph, with gusts as high as 20 mph.
Thursday
Cloudy through mid morning, then gradual clearing, with a high near 89. South wind 10 to 15 mph, with gusts as high as 25 mph.
Thursday Night
Mostly clear, with a low around 63. South wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 89. South wind 5 to 10 mph becoming east southeast in the afternoon.
Friday Night
Partly cloudy, with a low around 60. North northeast wind around 10 mph.
Saturday
Mostly sunny, with a high near 82. East northeast wind around 10 mph.
Saturday Night
Mostly clear, with a low around 54. East northeast wind around 5 mph becoming southeast after midnight.
Sunday
Sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 60.
Monday
Partly sunny, with a high near 89.
Monday Night
Partly cloudy, with a low around 64.
Tuesday
Partly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
11:04 pm CDT Mar 24, 2026
Forecast Valid:
11pm CDT Mar 24, 2026-6pm CDT Mar 31, 2026
 
Forecast Discussion
 
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Additional Resources

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