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

63°F

17°C

Humidity 65%
Wind Speed SE 10 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 16 Feb 8:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Increasing clouds, with a low around 54. South wind around 5 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Patchy fog between 7am and 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 82 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 60. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 20 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.

    High: 82 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 61. South wind around 5 mph.

    Low: 61 °F

    Mostly Cloudy

  • Thursday

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

    High: 84 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. Southeast wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. East wind 5 to 10 mph becoming north in the morning.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 56. East northeast wind around 5 mph.

    Low: 56 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 54. South wind around 5 mph.
Tuesday
Patchy fog between 7am and 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 82. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Increasing clouds, with a low around 60. South wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 82. Calm wind becoming south around 5 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 61. South wind around 5 mph.
Thursday
Partly sunny, with a high near 84. South southwest wind around 5 mph becoming north northeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 60. Southeast wind around 5 mph.
Friday
Mostly sunny, with a high near 80. East wind 5 to 10 mph becoming north in the morning.
Friday Night
Mostly cloudy, with a low around 56. East northeast wind around 5 mph.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Partly cloudy, with a low around 47.
Sunday
Mostly sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
5:42 pm CST Feb 16, 2026
Forecast Valid:
9pm CST Feb 16, 2026-6pm CST Feb 23, 2026
 
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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