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

49°F

9°C

Humidity 56%
Wind Speed NE 12 mph
Barometer 30.37 in (1028.3 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 8 Dec 9:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 61. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 61 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 35. East northeast wind around 5 mph becoming calm.

    Low: 35 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 67. Light west southwest wind becoming south southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 46. Southwest wind around 5 mph.

    Low: 46 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 75. Southwest wind 5 to 10 mph becoming southeast in the afternoon.

    High: 75 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47. East wind around 5 mph becoming north after midnight.

    Low: 47 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75. North wind around 5 mph becoming south in the afternoon.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 52. South wind around 5 mph becoming northwest after midnight.

    Low: 52 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 71. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 61. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight
Clear, with a low around 35. East northeast wind around 5 mph becoming calm.
Tuesday
Sunny, with a high near 67. Light west southwest wind becoming south southwest 5 to 10 mph in the afternoon. Winds could gust as high as 20 mph.
Tuesday Night
Clear, with a low around 46. Southwest wind around 5 mph.
Wednesday
Sunny, with a high near 75. Southwest wind 5 to 10 mph becoming southeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 47. East wind around 5 mph becoming north after midnight.
Thursday
Sunny, with a high near 75. North wind around 5 mph becoming south in the afternoon.
Thursday Night
Mostly clear, with a low around 52. South wind around 5 mph becoming northwest after midnight.
Friday
Mostly sunny, with a high near 71. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 47.
Saturday
Partly sunny, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 49.
Sunday
Mostly cloudy, with a high near 61.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
6:42 am CST Dec 8, 2025
Forecast Valid:
10am CST Dec 8, 2025-6pm CST Dec 14, 2025
 
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