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

59°F

15°C

Humidity 100%
Wind Speed N 3 mph
Barometer 30.14 in (1020.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 11 Feb 2:56 am CST
Extended Forecast for

San Marcos Municipal Airport TX

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Calm wind becoming north around 5 mph.

    Low: 55 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 51. Northeast wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.

    High: 80 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 82. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Showers likely after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    Low: 62 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 81. South wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 53. West northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Slight Chance
    Showers then
    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55. Calm wind becoming north around 5 mph.
Wednesday
Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 51. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 58. South wind around 5 mph.
Friday
Mostly cloudy, with a high near 82. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Showers likely after midnight. Mostly cloudy, with a low around 62. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Saturday
Showers and possibly a thunderstorm. High near 81. South wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.
Saturday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 53. West northwest wind around 10 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 74.
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 52.
Tuesday
Partly sunny, with a high near 82.
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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:
2:32 am CST Feb 11, 2026
Forecast Valid:
3am CST Feb 11, 2026-6pm CST Feb 17, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation