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

68°F

20°C

Humidity 87%
Wind Speed S 16 mph
Barometer 29.97 in (1014.4 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 14 Feb 12:56 am CST
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Overnight

    Overnight: A 30 percent chance of showers. Cloudy, with a low around 63. South southeast wind around 10 mph.

    Low: 63 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 74. South southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 74 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming clear, with a low around 54. West wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Slight Chance
    T-storms then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 74. North northwest 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 46. North wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51. South wind around 5 mph.

    Low: 51 °F

    Mostly Clear

  • Tuesday

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

    High: 83 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers. Cloudy, with a low around 63. South southeast wind around 10 mph.
Saturday
Showers and possibly a thunderstorm. High near 74. South southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday Night
A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming clear, with a low around 54. West wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 74. North northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 46. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Sunny, with a high near 78. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 51. South wind around 5 mph.
Tuesday
Partly 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 57. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 83.
Wednesday Night
Mostly cloudy, with a low around 59.
Thursday
Partly sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 57.
Friday
Partly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
12:46 am CST Feb 14, 2026
Forecast Valid:
1am CST Feb 14, 2026-6pm CST Feb 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation