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

58°F

14°C

Humidity 28%
Wind Speed SE 5 mph
Barometer 30.18 in (1021.7 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 7 Feb 8:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 49. South wind around 5 mph becoming calm.

    Low: 49 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 78. Light south southwest wind increasing to 5 to 10 mph in the morning.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 79. South wind 5 to 10 mph.

    High: 79 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59. South wind 5 to 10 mph.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 74 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 57. South wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Calm wind becoming south southwest around 5 mph in the morning.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 5 mph.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 49. South wind around 5 mph becoming calm.
Sunday
Partly sunny, with a high near 78. Light south southwest wind increasing to 5 to 10 mph in the morning.
Sunday Night
Partly cloudy, with a low around 54. South wind around 5 mph.
Monday
Partly sunny, with a high near 79. South wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 59. South wind 5 to 10 mph.
Tuesday
A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 74. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 57. South wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming south southwest around 5 mph in the morning.
Wednesday Night
Mostly clear, with a low around 57. South wind around 5 mph.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 57.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 79.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.91°W (Elev. 597 ft)
Last Update:
5:44 pm CST Feb 7, 2026
Forecast Valid:
9pm CST Feb 7, 2026-6pm CST Feb 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation