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

68°F

20°C

Humidity 76%
Wind Speed S 5 mph
Barometer 29.94 in (1013.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 5 Nov 7:56 pm CST
Extended Forecast for

4 Miles W San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 57. Light and variable wind becoming north northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, then gradually becoming sunny, with a high near 75. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 75 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 56. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 40 percent chance of showers after noon. Cloudy, with a high near 70. Northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 70 °F

    Cloudy then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and 3am, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 63. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 63 °F

    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 49. North northeast wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly before noon. Partly sunny, with a high near 66. North wind around 5 mph becoming calm.

    High: 66 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 49. Calm wind.

    Low: 49 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 57. Light and variable wind becoming north northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph.
Friday
Partly sunny, then gradually becoming sunny, with a high near 75. North northeast wind 5 to 15 mph, with gusts as high as 25 mph.
Friday Night
Increasing clouds, with a low around 56. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A 40 percent chance of showers after noon. Cloudy, with a high near 70. Northeast wind around 10 mph, with gusts as high as 20 mph.
Saturday Night
Showers likely and possibly a thunderstorm before 9pm, then showers likely between 9pm and 3am, then showers likely and possibly a thunderstorm after 3am. Cloudy, with a low around 52. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Sunday
Showers and possibly a thunderstorm. High near 63. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 49. North northeast wind around 5 mph becoming calm in the evening.
Monday
A 30 percent chance of showers, mainly before noon. Partly sunny, with a high near 66. North wind around 5 mph becoming calm.
Monday Night
Partly cloudy, with a low around 49. Calm wind.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Partly cloudy, with a low around 51.
Veterans Day
Partly sunny, with a high near 75.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Mostly sunny, with a high near 75.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W San Marcos TX
 29.88°N 97.99°W (Elev. 725 ft)
Last Update:
5:46 pm CST Nov 5, 2026
Forecast Valid:
8pm CST Nov 5, 2026-6pm CST Nov 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation