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 69%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 8 Oct 9:56 pm CDT
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: Mostly clear, with a low around 68. North northeast wind around 5 mph becoming calm.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90. Northeast wind around 5 mph.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 66. East northeast wind around 5 mph becoming calm.

    Low: 66 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 90. North northwest wind around 5 mph becoming calm.

    High: 90 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 67. Calm wind becoming south around 5 mph.

    Low: 67 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 91. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71. South southeast wind 5 to 10 mph.

    Low: 71 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 92. Light southeast wind becoming south 5 to 10 mph in the morning.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. South wind around 5 mph.

    Low: 74 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 68. North northeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 90. Northeast wind around 5 mph.
Friday Night
Clear, with a low around 66. East northeast wind around 5 mph becoming calm.
Saturday
Sunny, with a high near 90. North northwest wind around 5 mph becoming calm.
Saturday Night
Clear, with a low around 67. Calm wind becoming south around 5 mph.
Sunday
Sunny, with a high near 91. South wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 71. South southeast wind 5 to 10 mph.
Columbus Day
Mostly sunny, with a high near 92. Light southeast wind becoming south 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 74. South wind around 5 mph.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 75.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 91.
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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:
6:42 pm CDT Oct 8, 2026
Forecast Valid:
10pm CDT Oct 8, 2026-6pm CDT Oct 15, 2026
 
Forecast Discussion
 
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Additional Resources

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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