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

77°F

25°C

Humidity 58%
Wind Speed S 10 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 14 Mar 12:56 pm CDT
Extended Forecast for

3 Miles WNW 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

  • This Afternoon

    This Afternoon: Sunny, with a high near 84. South wind around 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 64. South southeast wind around 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy through mid morning, then gradual clearing, with a high near 93. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 93 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. Breezy, with a north wind 20 to 25 mph, with gusts as high as 45 mph.

    Low: 39 °F

    Mostly Clear
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 58. North wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 58 °F

    Mostly Sunny

  • 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 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

Detailed Forecast

This Afternoon
Sunny, with a high near 84. South wind around 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 64. South southeast wind around 10 mph, with gusts as high as 20 mph.
Sunday
Cloudy through mid morning, then gradual clearing, with a high near 93. South southwest wind 10 to 15 mph becoming west northwest in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 39. Breezy, with a north wind 20 to 25 mph, with gusts as high as 45 mph.
Monday
Mostly sunny, with a high near 58. North wind 10 to 15 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 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
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 84.
Thursday Night
Clear, with a low around 55.
Friday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW San Marcos TX
 29.9°N 97.97°W (Elev. 686 ft)
Last Update:
1:24 pm CDT Mar 14, 2026
Forecast Valid:
1pm CDT Mar 14, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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