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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Partly cloudy, with a low around 53. Northeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 83. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 61. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Increasing
    Clouds

  • Monday

    Monday: Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 88 °F

    Gradual
    Clearing

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 90. South wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 65. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 65 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Cloudy then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 53. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 83. Light south southwest wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
Increasing clouds, with a low around 61. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday
Cloudy through mid morning, then gradual clearing, with a high near 88. South wind 5 to 15 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 63. South southeast wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
Partly sunny, with a high near 90. South wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 65. South southeast wind 10 to 20 mph, with gusts as high as 30 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 90. South wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Friday
Mostly cloudy, with a high near 90.
Friday Night
Mostly cloudy, with a low around 65.
Saturday
A 30 percent chance of showers. Mostly cloudy, with a high near 84.
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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:
2:46 pm CDT Mar 28, 2026
Forecast Valid:
4pm CDT Mar 28, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation