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

71°F

22°C

Humidity 29%
Wind Speed NE 6 mph
Barometer 30.28 in (1024.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 7 Feb 10:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 81. East northeast wind around 5 mph becoming south southeast in the afternoon.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 50. South wind around 5 mph.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 77. South southwest wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 60. South wind 5 to 10 mph.

    Low: 60 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 73. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 73 °F

    Chance
    Showers

  • Tuesday Night

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

    Low: 58 °F

    Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83. Southwest wind around 5 mph.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 81. East northeast wind around 5 mph becoming south southeast in the afternoon.
Tonight
Partly cloudy, with a low around 50. South wind around 5 mph.
Sunday
Partly sunny, with a high near 77. South southwest wind 5 to 10 mph.
Sunday Night
Partly cloudy, with a low around 54. South wind around 5 mph.
Monday
Partly sunny, with a high near 78. South wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 60. South wind 5 to 10 mph.
Tuesday
A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 73. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 30 percent chance of showers before midnight. Mostly cloudy, with a low around 58. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 83. Southwest wind around 5 mph.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Partly cloudy, with a low around 59.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 79.
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:
11:44 am CST Feb 7, 2026
Forecast Valid:
11am CST Feb 7, 2026-6pm CST Feb 13, 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