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

82°F

28°C

Humidity 74%
Wind Speed SE 14 mph
Barometer 30.18 in (1021.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 17 Sep 9:56 pm CDT
Extended Forecast for

2 Miles SSW San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming light and variable after midnight.

    Low: 74 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph in the morning.

    High: 97 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73. East southeast wind around 5 mph becoming calm after midnight.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 97. Heat index values as high as 102. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 97 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. South southeast wind around 5 mph becoming calm after midnight.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 98. Calm wind becoming south around 5 mph in the afternoon.

    High: 98 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 75. South wind around 5 mph.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 97. Calm wind becoming south southeast around 5 mph.

    High: 97 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 74. Southeast wind 5 to 10 mph becoming light and variable after midnight.
Friday
Mostly sunny, with a high near 97. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 73. East southeast wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 97. Heat index values as high as 102. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 73. South southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 98. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 75. South wind around 5 mph.
Monday
Mostly sunny, with a high near 97. Calm wind becoming south southeast around 5 mph.
Monday Night
Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 97.
Tuesday Night
Partly cloudy, with a low around 75.
Wednesday
Mostly sunny, with a high near 98.
Wednesday Night
Partly cloudy, with a low around 75.
Thursday
Mostly sunny, with a high near 98.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW San Marcos TX
 29.86°N 97.94°W (Elev. 679 ft)
Last Update:
10:46 pm CDT Sep 17, 2026
Forecast Valid:
10pm CDT Sep 17, 2026-6pm CDT Sep 24, 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