National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

49°F

9°C

Humidity 90%
Wind Speed NW 5 mph
Barometer 30.05 in (1017.3 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 16 Feb 1:56 am CST
Extended Forecast for

4 Miles WNW San Marcos TX

  • Overnight

    Overnight: Partly cloudy, with a low around 46. Calm wind.

    Low: 46 °F

    Partly Cloudy

  • Washington's Birthday

    Washington's Birthday: Patchy fog between 8am and 9am. Otherwise, sunny, with a high near 76. Calm wind becoming south around 5 mph in the afternoon.

    High: 76 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 52. South wind around 5 mph.

    Low: 52 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 81. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 81 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 59. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 81. Calm wind becoming south around 5 mph in the morning.

    High: 81 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 84. South southwest wind around 5 mph becoming east southeast in the afternoon.

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 60. East wind around 5 mph becoming south after midnight.

    Low: 60 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 46. Calm wind.
Washington's Birthday
Patchy fog between 8am and 9am. Otherwise, sunny, with a high near 76. Calm wind becoming south around 5 mph in the afternoon.
Monday Night
Increasing clouds, with a low around 52. South wind around 5 mph.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 81. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Partly cloudy, with a low around 59. South wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a high near 81. Calm wind becoming south around 5 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 60. South wind around 5 mph.
Thursday
Partly sunny, with a high near 84. South southwest wind around 5 mph becoming east southeast in the afternoon.
Thursday Night
Mostly cloudy, with a low around 60. East wind around 5 mph becoming south after midnight.
Friday
Mostly cloudy, with a high near 80.
Friday Night
Mostly cloudy, with a low around 54.
Saturday
Partly sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 46.
Sunday
Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW San Marcos TX
 29.9°N 97.99°W (Elev. 850 ft)
Last Update:
12:44 am CST Feb 16, 2026
Forecast Valid:
2am CST Feb 16, 2026-6pm CST Feb 22, 2026
 
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