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

44°F

7°C

Humidity 71%
Wind Speed Calm
Barometer 30.23 in (1023.3 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 8 Feb 6:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Mostly sunny, with a high near 78. South southwest wind 5 to 10 mph.

    High: 78 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 54. South southwest wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 80. South southwest wind 5 to 10 mph.

    High: 80 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 59. South wind 5 to 10 mph.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers after noon. Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Cloudy then
    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 59. South southeast wind around 5 mph becoming calm after midnight.

    Low: 59 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 79. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. East southeast wind around 5 mph becoming south southwest after midnight.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 83. South southwest wind 5 to 10 mph.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 78. South southwest wind 5 to 10 mph.
Tonight
Partly cloudy, with a low around 54. South southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 80. South southwest wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 59. South wind 5 to 10 mph.
Tuesday
A 20 percent chance of showers after noon. 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 59. South southeast wind around 5 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 79. Calm wind becoming south southeast around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 57. East southeast wind around 5 mph becoming south southwest after midnight.
Thursday
Mostly sunny, with a high near 83. South southwest wind 5 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 59.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 80.
Friday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 58.
Saturday
A 30 percent chance of showers. Partly 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:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
7:08 am CST Feb 8, 2026
Forecast Valid:
7am CST Feb 8, 2026-6pm CST Feb 14, 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