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 33%
Wind Speed S 3 mph
Barometer 30.23 in (1023.4 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 20 Mar 11:56 pm CDT
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Clear, with a low around 41. South southwest wind around 5 mph.

    Low: 41 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 78. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

    High: 78 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 84. South southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 60. South wind 5 to 10 mph becoming north northeast after midnight.

    Low: 60 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. North northeast wind around 10 mph.

    High: 80 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 57. East wind around 5 mph becoming south southeast after midnight.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 41. South southwest wind around 5 mph.
Friday
Sunny, with a high near 78. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Friday Night
Partly cloudy, with a low around 52. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Mostly sunny, with a high near 85. South wind 5 to 15 mph, with gusts as high as 25 mph.
Saturday Night
Partly cloudy, with a low around 62. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.
Sunday
Mostly cloudy, with a high near 84. South southwest wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 60. South wind 5 to 10 mph becoming north northeast after midnight.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. North northeast wind around 10 mph.
Monday Night
Mostly clear, with a low around 57. East wind around 5 mph becoming south southeast after midnight.
Tuesday
Sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
Mostly cloudy, with a low around 60.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
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ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
11:38 pm CDT Mar 20, 2025
Forecast Valid:
12am CDT Mar 21, 2025-6pm CDT Mar 27, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation