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

53°F

12°C

Humidity 93%
Wind Speed Calm
Barometer 29.93 in (1013.1 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 5 Nov 5:56 am CST
Extended Forecast for

3 Miles W San Marcos TX

  • Today

    Today: Sunny, with a high near 81. Calm wind becoming south around 5 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 56. Light and variable wind becoming north northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 75. North wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 75 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 54. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 30 percent chance of showers after noon. Mostly cloudy, with a high near 69. North northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 69 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm. 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 likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 65. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 48. North northeast wind around 5 mph becoming calm in the evening.

    Low: 48 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers. Mostly sunny, with a high near 68. North wind around 5 mph becoming calm.

    High: 68 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 81. Calm wind becoming south around 5 mph.
Tonight
Partly cloudy, with a low around 56. Light and variable wind becoming north northwest 10 to 15 mph after midnight. Winds could gust as high as 25 mph.
Friday
Sunny, with a high near 75. North wind 5 to 15 mph, with gusts as high as 25 mph.
Friday Night
Increasing clouds, with a low around 54. North wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A 30 percent chance of showers after noon. Mostly cloudy, with a high near 69. North northeast wind around 10 mph, with gusts as high as 20 mph.
Saturday Night
Showers likely and possibly a thunderstorm. 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 likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 65. North northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Sunday Night
A 30 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 48. North northeast wind around 5 mph becoming calm in the evening.
Monday
A 30 percent chance of showers. Mostly sunny, with a high near 68. North wind around 5 mph becoming calm.
Monday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 49.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 51.
Veterans Day
Mostly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W San Marcos TX
 29.88°N 97.99°W (Elev. 725 ft)
Last Update:
5:42 am CST Nov 5, 2026
Forecast Valid:
6am CST Nov 5, 2026-6pm CST Nov 11, 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