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

94°F

34°C

Humidity 32%
Wind Speed S 10 G 17 mph
Barometer 29.97 in (1013.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 17 Sep 4:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.

    Low: 69 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 94 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.

    Low: 69 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 94. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 94 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69. East southeast wind around 5 mph becoming calm after midnight.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. Southeast wind around 5 mph.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71. South southeast wind around 5 mph.

    Low: 71 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.
Thursday
Sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 69. Southeast wind around 5 mph becoming calm after midnight.
Friday
Sunny, with a high near 94. Calm wind becoming east southeast around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 69. East southeast wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 94. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 70. Southeast wind around 5 mph.
Sunday
Sunny, with a high near 94. Calm wind becoming south southeast around 5 mph in the morning.
Sunday Night
Mostly clear, with a low around 71. South southeast wind around 5 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers. Mostly sunny, with a high near 91.
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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:
2:42 pm CDT Sep 17, 2025
Forecast Valid:
5pm CDT Sep 17, 2025-6pm CDT Sep 24, 2025
 
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Additional Resources

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Chance of Precipitation