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.

A Few Clouds

73°F

23°C

Humidity 44%
Wind Speed NE 6 mph
Barometer 30.19 in (1021.8 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 11 Feb 1:56 pm CST
Extended Forecast for

San Marcos Municipal Airport TX

  • This Afternoon

    This Afternoon: Sunny, with a high near 74. North wind 5 to 10 mph.

    High: 74 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. Northeast wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming south around 5 mph in the afternoon.

    High: 79 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 57. South wind around 5 mph becoming calm after midnight.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 80. Light south wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 80 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 9am. High near 81. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 54. Northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Slight Chance
    Showers then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 76. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 76 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 74. North wind 5 to 10 mph.
Tonight
Mostly clear, with a low around 49. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 57. South wind around 5 mph becoming calm after midnight.
Friday
Mostly cloudy, with a high near 80. Light south wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Friday Night
A 50 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph.
Saturday
Showers, with thunderstorms also possible after 9am. High near 81. South southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 54. Northwest wind around 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 76. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 46.
Washington's Birthday
Sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 81.
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Forecast Area
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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 pm CST Feb 11, 2026
Forecast Valid:
2pm CST Feb 11, 2026-6pm CST Feb 17, 2026
 
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Additional Resources

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Chance of Precipitation