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.

Overcast

60°F

16°C

Humidity 93%
Wind Speed N 5 mph
Barometer 30.23 in (1023.4 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 9 Nov 7:56 pm CST
Extended Forecast for

San Marcos TX

  • Tonight

    Tonight: A slight chance of showers before 9pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 58. Calm wind. Chance of precipitation is 20%.

    Low: 58 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 69. Calm wind.

    High: 69 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Partly Cloudy

  • Veterans Day

    Veterans Day: Partly sunny, with a high near 76. Calm wind.

    High: 76 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. Light west northwest wind becoming north northwest 5 to 10 mph after midnight.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75. North wind 5 to 10 mph becoming light in the afternoon.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 50. Calm wind.

    Low: 50 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 75. Calm wind becoming northwest around 5 mph.

    High: 75 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 50. Calm wind.

    Low: 50 °F

    Clear

Detailed Forecast

Tonight
A slight chance of showers before 9pm, then a slight chance of showers after midnight. Mostly cloudy, with a low around 58. Calm wind. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 69. Calm wind.
Tuesday Night
Partly cloudy, with a low around 58. Calm wind.
Veterans Day
Partly sunny, with a high near 76. Calm wind.
Wednesday Night
Mostly clear, with a low around 57. Light west northwest wind becoming north northwest 5 to 10 mph after midnight.
Thursday
Sunny, with a high near 75. North wind 5 to 10 mph becoming light in the afternoon.
Thursday Night
Clear, with a low around 50. Calm wind.
Friday
Sunny, with a high near 75. Calm wind becoming northwest around 5 mph.
Friday Night
Clear, with a low around 50. Calm wind.
Saturday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 73.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 56.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 70.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 72.
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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:
7:46 pm CST Nov 9, 2026
Forecast Valid:
8pm CST Nov 9, 2026-6pm CST Nov 16, 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