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.

Overcast

61°F

16°C

Humidity 87%
Wind Speed NW 16 mph
Barometer 29.80 in (1008.7 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 14 Feb 1:56 pm CST
Extended Forecast for

San Marcos TX

  • This Afternoon

    This Afternoon: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. South southwest wind 10 to 15 mph becoming west. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 73 °F

    Showers
    Likely

  • Tonight

    Tonight: A 20 percent chance of showers before 9pm. Mostly clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Slight Chance
    Showers then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 74. North wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 74 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47. North wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 77. Calm wind becoming south around 5 mph in the afternoon.

    High: 77 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52. South wind around 5 mph.

    Low: 52 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 83. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 83. South wind around 5 mph.

    High: 83 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. South southwest wind 10 to 15 mph becoming west. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
A 20 percent chance of showers before 9pm. Mostly clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 74. North wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 47. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Sunny, with a high near 77. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 52. South wind around 5 mph.
Tuesday
Mostly sunny, with a high near 83. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 59. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 83. South wind around 5 mph.
Wednesday Night
Mostly cloudy, with a low around 61.
Thursday
Partly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 60.
Friday
Mostly sunny, with a high near 81.
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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 CST Feb 14, 2026
Forecast Valid:
2pm CST Feb 14, 2026-6pm CST Feb 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation