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

53°F

12°C

Humidity 72%
Wind Speed N 3 mph
Barometer 30.27 in (1024.5 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 19 Oct 1:56 am CDT
Extended Forecast for

3 Miles NW San Marcos Municipal Airport TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 51. Calm wind.

    Low: 51 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 83. Calm wind becoming east northeast around 5 mph in the morning.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 57. East northeast wind around 5 mph becoming calm.

    Low: 57 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. North wind around 5 mph becoming east northeast in the afternoon.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. East wind around 5 mph becoming calm.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 57. East wind around 5 mph becoming calm.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 51. Calm wind.
Monday
Mostly sunny, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 57. Calm wind.
Tuesday
Sunny, with a high near 83. Calm wind becoming east northeast around 5 mph in the morning.
Tuesday Night
Clear, with a low around 57. East northeast wind around 5 mph becoming calm.
Wednesday
Sunny, with a high near 85. North wind around 5 mph becoming east northeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 59. East wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 87. Calm wind becoming east southeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 57. East wind around 5 mph becoming calm.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Partly cloudy, with a low around 62.
Sunday
Partly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW San Marcos Municipal Airport TX
 29.95°N 97.89°W (Elev. 646 ft)
Last Update:
1:30 am CDT Oct 19, 2026
Forecast Valid:
2am CDT Oct 19, 2026-6pm CDT Oct 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