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

63°F

17°C

Humidity 93%
Wind Speed Calm
Barometer 29.72 in (1005.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 18 Feb 11:56 pm CST
Extended Forecast for

2 Miles SW San Marcos Municipal Airport TX

  • Overnight

    Overnight: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 63. South southwest wind around 5 mph.

    Low: 63 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 86. South southwest wind around 5 mph becoming north northeast in the afternoon.

    High: 86 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 3am. Otherwise, increasing clouds, with a low around 58. East wind around 5 mph becoming calm.

    Low: 58 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.

    High: 77 °F

    Patchy Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 58. Southeast wind around 5 mph becoming calm.

    Low: 58 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 78. North wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 42. North wind around 15 mph, with gusts as high as 25 mph.

    Low: 42 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38. North northeast wind 5 to 10 mph.

    Low: 38 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 63. South southwest wind around 5 mph.
Thursday
Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 86. South southwest wind around 5 mph becoming north northeast in the afternoon.
Thursday Night
Patchy fog after 3am. Otherwise, increasing clouds, with a low around 58. East wind around 5 mph becoming calm.
Friday
Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 77. Calm wind becoming southeast around 5 mph in the morning.
Friday Night
Mostly cloudy, with a low around 58. Southeast wind around 5 mph becoming calm.
Saturday
Mostly sunny, with a high near 78. North wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 42. North wind around 15 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Partly cloudy, with a low around 38. North northeast wind 5 to 10 mph.
Monday
Sunny, with a high near 65.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Mostly sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 82.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW San Marcos Municipal Airport TX
 29.88°N 97.89°W (Elev. 597 ft)
Last Update:
11:56 pm CST Feb 18, 2026
Forecast Valid:
12am CST Feb 19, 2026-6pm CST Feb 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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