National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

66°F

19°C

Humidity 49%
Wind Speed NE 10 mph
Barometer 29.76 in (1007.1 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Feb 5:56 pm CST
Extended Forecast for

3 Miles NNW San Marcos Municipal Airport TX

Red Flag Warning February 21, 10:00am until February 21, 09:00pm
Click here for hazard details and duration
Red Flag Warning

  • Tonight

    Tonight: Mostly cloudy, with a low around 54. North northeast wind around 5 mph becoming calm.

    Low: 54 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 75 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39. North wind around 15 mph, with gusts as high as 30 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36. North wind around 5 mph.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67. North wind around 5 mph becoming southeast in the afternoon.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 73 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 54. North northeast wind around 5 mph becoming calm.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 75. North wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
Mostly clear, with a low around 39. North wind around 15 mph, with gusts as high as 30 mph.
Sunday
Sunny, with a high near 64. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 36. North wind around 5 mph.
Monday
Sunny, with a high near 67. North wind around 5 mph becoming southeast in the afternoon.
Monday Night
Mostly clear, with a low around 38. Southeast wind around 5 mph becoming south southwest after midnight.
Tuesday
Mostly sunny, with a high near 73. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Tuesday Night
Mostly clear, with a low around 54. South wind around 15 mph, with gusts as high as 25 mph.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 80.
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:
5:44 pm CST Feb 20, 2026
Forecast Valid:
6pm CST Feb 20, 2026-6pm CST Feb 27, 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