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.

Overcast

69°F

21°C

Humidity 81%
Wind Speed S 13 mph
Barometer 29.70 in (1005.0 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 15 Mar 6:56 am CDT
Extended Forecast for

San Marcos TX

Wind Advisory March 15, 03:00pm until March 16, 05:00am
Red Flag Warning March 15, 12:00pm until March 16, 08:00pm
Click here for hazard details and duration
Wind Advisory
Red Flag Warning

  • Today

    Today: Cloudy through mid morning, then gradual clearing, with a high near 94. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 94 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. Windy, with a north wind 20 to 30 mph, with gusts as high as 45 mph.

    Low: 40 °F

    Mostly Clear
    and Windy

  • Monday

    Monday: Mostly sunny, with a high near 58. North wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 34. North northeast wind 5 to 10 mph becoming light and variable in the evening.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 67. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 67 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45. South wind 5 to 10 mph.

    Low: 45 °F

    Partly Cloudy

  • 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: Clear, with a low around 53. South wind around 5 mph.

    Low: 53 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Southwest wind 5 to 10 mph.

    High: 84 °F

    Sunny

Detailed Forecast

Today
Cloudy through mid morning, then gradual clearing, with a high near 94. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.
Tonight
Mostly clear, with a low around 40. Windy, with a north wind 20 to 30 mph, with gusts as high as 45 mph.
Monday
Mostly sunny, with a high near 58. North wind 15 to 20 mph, with gusts as high as 30 mph.
Monday Night
Mostly cloudy, with a low around 34. North northeast wind 5 to 10 mph becoming light and variable in the evening.
Tuesday
Sunny, with a high near 67. Light south southeast wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 45. South wind 5 to 10 mph.
Wednesday
Sunny, with a high near 78. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday Night
Clear, with a low around 53. South wind around 5 mph.
Thursday
Sunny, with a high near 84. Southwest wind 5 to 10 mph.
Thursday Night
Clear, with a low around 56.
Friday
Sunny, with a high near 91.
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:
6:44 am CDT Mar 15, 2026
Forecast Valid:
7am CDT Mar 15, 2026-6pm CDT Mar 21, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation