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

67°F

19°C

Humidity 97%
Wind Speed S 16 G 23 mph
Barometer 29.90 in (1011.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 23 Mar 3:56 am CDT
Extended Forecast for

San Marcos Municipal Airport TX

  • Today

    Today: Mostly cloudy, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 84 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 59. South wind around 5 mph becoming north northeast after midnight.

    Low: 59 °F

    Chance
    T-storms

  • Monday

    Monday: Sunny, with a high near 86. North northeast wind around 5 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60. East wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 90. Light south southwest wind becoming south southeast 5 to 10 mph in the afternoon.

    High: 90 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 60. Southeast wind 5 to 10 mph.

    Low: 60 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 86. South wind 5 to 10 mph.

    High: 86 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 75. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 75 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 84. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 59. South wind around 5 mph becoming north northeast after midnight.
Monday
Sunny, with a high near 86. North northeast wind around 5 mph.
Monday Night
Partly cloudy, with a low around 60. East wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 90. Light south southwest wind becoming south southeast 5 to 10 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 60. Southeast wind 5 to 10 mph.
Wednesday
Mostly cloudy, with a high near 86. South wind 5 to 10 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Cloudy, with a high near 75. Southeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 62. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Saturday
Partly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos Municipal Airport TX
 29.88°N 97.86°W (Elev. 600 ft)
Last Update:
2:42 am CDT Mar 23, 2025
Forecast Valid:
4am CDT Mar 23, 2025-6pm CDT Mar 29, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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