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

51°F

11°C

Humidity 96%
Wind Speed SW 5 mph
Barometer 30.15 in (1020.4 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 9 Feb 4:56 am CST
Extended Forecast for

San Marcos TX

  • Today

    Today: Sunny, with a high near 83. Southwest wind around 5 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 58. South wind 5 to 10 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 59. South southeast wind around 5 mph becoming calm after midnight.

    Low: 59 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before noon. Mostly sunny, with a high near 77. Calm wind becoming north around 5 mph in the morning.

    High: 77 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 57. Northeast wind around 5 mph becoming calm.

    Low: 57 °F

    Partly Cloudy

  • Thursday

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

    High: 81 °F

    Partly Sunny

  • Thursday Night

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

    Low: 60 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 82 °F

    Mostly Cloudy

Detailed Forecast

Today
Sunny, with a high near 83. Southwest wind around 5 mph.
Tonight
Increasing clouds, with a low around 58. South wind 5 to 10 mph.
Tuesday
Cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 59. South southeast wind around 5 mph becoming calm after midnight.
Wednesday
A 20 percent chance of showers before noon. Mostly sunny, with a high near 77. Calm wind becoming north around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 57. Northeast wind around 5 mph becoming calm.
Thursday
Partly sunny, with a high near 81. Calm wind becoming south around 5 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 60. South wind around 5 mph.
Friday
Mostly cloudy, with a high near 82. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A slight chance of showers, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 60. Chance of precipitation is 40%.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 48.
Sunday
Sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
4:33 am CST Feb 9, 2026
Forecast Valid:
5am CST Feb 9, 2026-6pm CST Feb 15, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation