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

74°F

23°C

Humidity 38%
Wind Speed SW 6 mph
Barometer 30.14 in (1020.1 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 8 Feb 5:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 54. Southwest wind around 5 mph.

    Low: 54 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 82. Southwest wind around 5 mph.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 58. South wind 5 to 10 mph.

    Low: 58 °F

    Mostly Cloudy

  • 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 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 60. South southeast wind around 5 mph becoming calm after midnight.

    Low: 60 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 58. East wind around 5 mph becoming calm.

    Low: 58 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the morning.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 59. South wind around 5 mph.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 54. Southwest wind around 5 mph.
Monday
Mostly sunny, with a high near 82. Southwest wind around 5 mph.
Monday Night
Mostly cloudy, 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 30 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 60. South southeast wind around 5 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 58. East wind around 5 mph becoming calm.
Thursday
Mostly sunny, with a high near 82. Calm wind becoming south southwest around 5 mph in the morning.
Thursday Night
Partly cloudy, with a low around 59. South wind around 5 mph.
Friday
Mostly sunny, with a high near 81.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 77.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 49.
Sunday
Mostly sunny, with a high near 77.
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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:
6:46 pm CST Feb 8, 2026
Forecast Valid:
6pm CST Feb 8, 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