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

88°F

31°C

Humidity 43%
Wind Speed SW 14 mph
Barometer 29.65 in (1003.2 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 15 Mar 1:56 pm CDT
Extended Forecast for

San Marcos TX

Wind Advisory March 15, 03:00pm until March 16, 05:00am
Red Flag Warning March 15, 02:07pm until March 16, 08:00pm
Click here for hazard details and duration
Wind Advisory
Red Flag Warning
  •  
    Red Flag Warning March 15, 02:07pm until March 16, 08:00pm

    NOW until 8:00pm Mon

    Red Flag Warning

  • This Afternoon

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 42. Windy, with a north wind 25 to 30 mph, with gusts as high as 45 mph.

    Low: 42 °F

    Mostly Clear
    and Windy

  • Monday

    Monday: Increasing clouds, with a high near 57. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 57 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 35. North northeast wind 5 to 10 mph becoming light and variable in the evening.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

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

    High: 66 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 43. South wind 5 to 10 mph.

    Low: 43 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77. South wind 5 to 10 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

Detailed Forecast

This Afternoon
Sunny, with a high near 95. West wind around 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 42. Windy, with a north wind 25 to 30 mph, with gusts as high as 45 mph.
Monday
Increasing clouds, with a high near 57. North wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
Mostly cloudy, 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 southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Mostly clear, with a low around 43. South wind 5 to 10 mph.
Wednesday
Sunny, with a high near 77. South wind 5 to 10 mph.
Wednesday Night
Mostly clear, with a low around 52. South wind around 5 mph.
Thursday
Sunny, with a high near 85. Southwest wind 5 to 10 mph.
Thursday Night
Clear, with a low around 56.
Friday
Sunny, with a high near 88.
Friday Night
Clear, with a low around 59.
Saturday
Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
1:46 pm CDT Mar 15, 2026
Forecast Valid:
2pm CDT Mar 15, 2026-6pm CDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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