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 and Breezy

74°F

23°C

Humidity 76%
Wind Speed S 24 G 29 mph
Barometer 29.90 in (1011.7 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 2 Apr 10:56 pm CDT
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Mostly cloudy, with a low around 69. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 69 °F

    Mostly Cloudy

  • Friday

    Friday: Cloudy, then gradually becoming mostly sunny, with a high near 88. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 88 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Increasing clouds, with a low around 68. South southeast wind 10 to 20 mph, with gusts as high as 30 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 78. South southeast wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

    High: 78 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. North northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    Low: 52 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 66. North northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Slight Chance
    Showers

  • Monday

    Monday: Mostly cloudy, with a high near 69. North northeast wind 5 to 10 mph.

    High: 69 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 47. East northeast wind around 5 mph becoming calm in the evening.

    Low: 47 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 69. South wind around 10 mph, with gusts as high as 20 mph.
Friday
Cloudy, then gradually becoming mostly sunny, with a high near 88. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Friday Night
A 50 percent chance of showers and thunderstorms. Increasing clouds, with a low around 68. South southeast wind 10 to 20 mph, with gusts as high as 30 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and possibly a thunderstorm. High near 78. South southeast wind 5 to 15 mph becoming north in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. North northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 66. North northeast wind around 15 mph, with gusts as high as 25 mph.
Sunday Night
A 20 percent chance of showers. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, with a high near 69. North northeast wind 5 to 10 mph.
Monday Night
Partly cloudy, with a low around 47. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 50.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Mostly cloudy, with a low around 58.
Thursday
Mostly cloudy, 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:
11:32 pm CDT Apr 2, 2026
Forecast Valid:
11pm CDT Apr 2, 2026-6pm CDT Apr 9, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation