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

78°F

26°C

Humidity 35%
Wind Speed SW 7 mph
Barometer 30.14 in (1020.1 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 8 Feb 4:56 pm CST
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

  • Tonight

    Tonight: Partly cloudy, with a low around 53. Southwest wind around 5 mph.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 82. Southwest wind 5 to 10 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 57. South wind 5 to 10 mph.

    Low: 57 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph becoming calm after midnight.

    Low: 58 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. East northeast wind around 5 mph becoming calm.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 53. Southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 82. Southwest wind 5 to 10 mph.
Monday Night
Increasing clouds, with a low around 57. South wind 5 to 10 mph.
Tuesday
Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 58. South southeast wind around 5 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 56. East northeast wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 82. Light south wind becoming south southwest 5 to 10 mph in the morning.
Thursday Night
Partly cloudy, with a low around 58. South wind around 5 mph.
Friday
Mostly sunny, with a high near 82.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 77.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 48.
Sunday
Mostly sunny, with a high near 77.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
5:32 pm CST Feb 8, 2026
Forecast Valid:
5pm CST Feb 8, 2026-6pm CST Feb 15, 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