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

48°F

9°C

Humidity 74%
Wind Speed N 3 mph
Barometer 30.18 in (1021.8 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 12 Feb 6:56 am CST
Extended Forecast for

4 Miles SSW San Marcos TX

  • Today

    Today: Mostly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.

    High: 80 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 60. South southeast wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 82. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 63. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 9am. High near 80. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.

    High: 80 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. West wind around 10 mph becoming north northwest after midnight. Winds could gust as high as 20 mph.

    Low: 55 °F

    Slight Chance
    Showers then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 77. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 77 °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 79. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 79 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 60. South southeast wind around 5 mph.
Friday
Mostly cloudy, with a high near 82. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 63. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers, with thunderstorms also possible after 9am. High near 80. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 55. West wind around 10 mph becoming north northwest after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 77. North northwest wind 10 to 15 mph, with gusts as high as 25 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 79. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 51.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW San Marcos TX
 29.83°N 97.94°W (Elev. 610 ft)
Last Update:
6:40 am CST Feb 12, 2026
Forecast Valid:
7am CST Feb 12, 2026-6pm CST Feb 18, 2026
 
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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