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

67°F

19°C

Humidity 41%
Wind Speed NE 10 mph
Barometer 29.80 in (1008.6 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 20 Feb 1:56 pm CST
Extended Forecast for

4 Miles WNW San Marcos TX

Red Flag Warning February 21, 10:00am until February 21, 09:00pm
Click here for hazard details and duration
Red Flag Warning

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 70. North northeast wind around 5 mph.

    High: 70 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 55. Northeast wind around 5 mph becoming calm.

    Low: 55 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 74. North wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 74 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40. North wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 64. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 64 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. North wind around 5 mph.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 66. North wind around 5 mph becoming southeast in the afternoon.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. Southeast wind around 5 mph becoming south southwest after midnight.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 73. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 70. North northeast wind around 5 mph.
Tonight
Mostly cloudy, with a low around 55. Northeast wind around 5 mph becoming calm.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 74. North wind 5 to 15 mph, with gusts as high as 30 mph.
Saturday Night
Mostly clear, with a low around 40. North wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday
Sunny, with a high near 64. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 37. North wind around 5 mph.
Monday
Sunny, with a high near 66. North wind around 5 mph becoming southeast in the afternoon.
Monday Night
Mostly clear, with a low around 40. Southeast wind around 5 mph becoming south southwest after midnight.
Tuesday
Mostly sunny, with a high near 73. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 54.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
12:44 pm CST Feb 20, 2026
Forecast Valid:
2pm CST Feb 20, 2026-6pm CST Feb 26, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation