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

61°F

16°C

Humidity 87%
Wind Speed S 5 mph
Barometer 30.09 in (1018.2 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 13 Feb 12:56 am CST
Extended Forecast for

San Marcos TX

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. South wind around 5 mph.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 80 °F

    Patchy Fog
    then Partly
    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers, mainly between midnight and 3am. Mostly cloudy, with a low around 64. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely, then showers and possibly a thunderstorm after 9am. High near 74. South southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 56 °F

    Chance
    Showers then
    Clear

  • Sunday

    Sunday: Sunny, with a high near 74. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 74 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47. North wind 5 to 10 mph becoming light in the evening.

    Low: 47 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51. South southeast wind around 5 mph.

    Low: 51 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. South wind around 5 mph.
Friday
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 80. South wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
A 30 percent chance of showers, mainly between midnight and 3am. Mostly cloudy, with a low around 64. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Showers likely, then showers and possibly a thunderstorm after 9am. High near 74. South southeast wind 10 to 15 mph becoming west southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Saturday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly clear, with a low around 56. West wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 74. North northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 47. North wind 5 to 10 mph becoming light in the evening.
Washington's Birthday
Sunny, with a high near 78. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 51. South southeast wind around 5 mph.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Mostly cloudy, with a low around 57.
Wednesday
Partly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
San Marcos TX
 29.88°N 97.94°W (Elev. 577 ft)
Last Update:
12:48 am CST Feb 13, 2026
Forecast Valid:
1am CST Feb 13, 2026-6pm CST Feb 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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