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

82°F

28°C

Humidity 14%
Wind Speed NE 6 mph
Barometer 30.12 in (1019.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 6 Feb 4:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Clear, with a low around 48. Calm wind becoming west northwest around 5 mph.

    Low: 48 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 80. North wind around 5 mph becoming southeast in the afternoon.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 51. Southeast wind around 5 mph becoming calm after midnight.

    Low: 51 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 75. Light south southwest wind becoming south 5 to 10 mph in the morning.

    High: 75 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 56. South wind around 5 mph.

    Low: 56 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 76 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 58. South wind around 5 mph.

    Low: 58 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 56. South wind around 5 mph.

    Low: 56 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 48. Calm wind becoming west northwest around 5 mph.
Saturday
Sunny, with a high near 80. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 51. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Partly sunny, with a high near 75. Light south southwest wind becoming south 5 to 10 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 56. South wind around 5 mph.
Monday
Mostly cloudy, with a high near 76. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 58. South wind around 5 mph.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
Partly cloudy, with a low around 56. South wind around 5 mph.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 56.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 56.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 74.
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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:
4:32 pm CST Feb 6, 2026
Forecast Valid:
5pm CST Feb 6, 2026-6pm CST Feb 13, 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