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

88°F

31°C

Humidity 36%
Wind Speed SE 16 mph
Barometer 29.93 in (1012.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 26 Mar 4:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Friday

    Friday: Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 10 mph becoming east northeast in the afternoon.

    High: 88 °F

    Gradual
    Clearing

  • Friday Night

    Friday Night: Increasing clouds, with a low around 59. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 75. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57. Northeast wind around 5 mph becoming south southeast after midnight.

    Low: 57 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 84. Light south wind increasing to 5 to 10 mph in the morning.

    High: 84 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 61. South southeast wind 5 to 10 mph.

    Low: 61 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 89. South wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 89 °F

    Mostly Cloudy

  • Monday Night

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

    Low: 63 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Friday
Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 10 mph becoming east northeast in the afternoon.
Friday Night
Increasing clouds, with a low around 59. North wind around 10 mph, with gusts as high as 20 mph.
Saturday
Partly sunny, with a high near 75. North northeast wind around 10 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 57. Northeast wind around 5 mph becoming south southeast after midnight.
Sunday
Partly sunny, with a high near 84. Light south wind increasing to 5 to 10 mph in the morning.
Sunday Night
Partly cloudy, with a low around 61. South southeast wind 5 to 10 mph.
Monday
Mostly cloudy, with a high near 89. South wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Partly sunny, with a high near 89.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Partly sunny, with a high near 91.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 64.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, 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:
2:46 pm CDT Mar 26, 2026
Forecast Valid:
5pm CDT Mar 26, 2026-6pm CDT Apr 2, 2026
 
Forecast Discussion
 
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Additional Resources

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