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 and Windy

44°F

7°C

Humidity 32%
Wind Speed N 26 G 35 mph
Barometer 30.27 in (1024.6 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 16 Mar 5:56 am CDT
Extended Forecast for

San Marcos TX

Red Flag Warning March 16, 06:18am until March 16, 08:00pm
Click here for hazard details and duration
Red Flag Warning
  •  
    Red Flag Warning March 16, 06:18am until March 16, 08:00pm

    NOW until 8:00pm Mon

    Red Flag Warning

  • Today

    High: 57 °F

    Mostly Sunny
    and Breezy
    then Partly
    Sunny

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 35. North northeast wind 5 to 10 mph becoming light and variable in the evening.

    Low: 35 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 66. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 66 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 44. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 44 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 52. South wind around 5 mph.

    Low: 52 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Southwest wind around 5 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 56. South wind around 5 mph.

    Low: 56 °F

    Clear

Detailed Forecast

Today
Increasing clouds, with a high near 57. Breezy, with a north wind 15 to 25 mph, with gusts as high as 35 mph.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 35. North northeast wind 5 to 10 mph becoming light and variable in the evening.
Tuesday
Sunny, with a high near 66. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 44. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 52. South wind around 5 mph.
Thursday
Sunny, with a high near 84. Southwest wind around 5 mph.
Thursday Night
Clear, with a low around 56. South wind around 5 mph.
Friday
Sunny, with a high near 91. Southwest wind 5 to 10 mph.
Friday Night
Clear, with a low around 59.
Saturday
Sunny, with a high near 93.
Saturday Night
Clear, with a low around 60.
Sunday
Sunny, with a high near 92.
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:
5:32 am CDT Mar 16, 2026
Forecast Valid:
6am CDT Mar 16, 2026-6pm CDT Mar 22, 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