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

57°F

14°C

Humidity 15%
Wind Speed N 16 G 23 mph
Barometer 30.31 in (1026.3 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 16 Mar 2:56 pm CDT
Extended Forecast for

San Marcos TX

Red Flag Warning March 16, 03:42pm until March 16, 08:00pm
Click here for hazard details and duration
Red Flag Warning
  •  
    Red Flag Warning March 16, 03:42pm until March 16, 08:00pm

    NOW until 8:00pm Mon

    Red Flag Warning

  • This Afternoon

    High: 57 °F

    Mostly Cloudy

  • Tonight

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

    Low: 35 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 66. Light south southwest 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 45. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 51. South wind around 5 mph.

    Low: 51 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. South southwest wind around 5 mph.

    High: 83 °F

    Sunny

  • Thursday Night

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

    Low: 56 °F

    Clear

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 57. North wind around 15 mph, with gusts as high as 25 mph.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 35. North wind 5 to 10 mph becoming light and variable after midnight.
Tuesday
Sunny, with a high near 66. Light south southwest 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 45. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 78. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 51. South wind around 5 mph.
Thursday
Sunny, with a high near 83. South southwest wind around 5 mph.
Thursday Night
Clear, with a low around 56. South wind around 5 mph.
Friday
Sunny, with a high near 90. Southwest wind 5 to 10 mph.
Friday Night
Clear, with a low around 58.
Saturday
Sunny, with a high near 93.
Saturday Night
Clear, with a low around 60.
Sunday
Sunny, with a high near 92.
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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:
2:44 pm CDT Mar 16, 2026
Forecast Valid:
3pm CDT Mar 16, 2026-6pm CDT Mar 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation