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.

Fair

70°F

21°C

Humidity 18%
Wind Speed NW 5 mph
Barometer 30.25 in (1024.2 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 5 Feb 4:56 pm CST
Extended Forecast for

4 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Clear, with a low around 45. West southwest wind around 5 mph.

    Low: 45 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 80. West wind around 5 mph becoming calm in the afternoon.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 46. Calm wind becoming north around 5 mph after midnight.

    Low: 46 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 78. North wind around 5 mph becoming southeast in the afternoon.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm after midnight.

    Low: 47 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 76. Calm wind becoming south around 5 mph in the morning.

    High: 76 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 53. South wind around 5 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly cloudy, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: A 30 percent chance of showers, mainly after midnight. Cloudy, with a low around 57. South wind around 5 mph.

    Low: 57 °F

    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 45. West southwest wind around 5 mph.
Friday
Sunny, with a high near 80. West wind around 5 mph becoming calm in the afternoon.
Friday Night
Clear, with a low around 46. Calm wind becoming north around 5 mph after midnight.
Saturday
Sunny, with a high near 78. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 47. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly cloudy, with a high near 76. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 53. South wind around 5 mph.
Monday
A 20 percent chance of showers after noon. Mostly cloudy, with a high near 78. South wind 5 to 10 mph.
Monday Night
A 30 percent chance of showers, mainly after midnight. Cloudy, with a low around 57. South wind around 5 mph.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 76.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
Partly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
4:32 pm CST Feb 5, 2026
Forecast Valid:
5pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation