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.

Mostly Cloudy

81°F

27°C

Humidity 85%
Wind Speed S 9 mph
Barometer 30.05 in (1016.8 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 5 Aug 8:56 am CDT
Extended Forecast for

2 Miles WNW San Marcos TX

  • Today

    Today: Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.

    High: 98 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 97. Heat index values as high as 104. South wind around 5 mph.

    High: 97 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 76. South wind 5 to 10 mph.

    Low: 76 °F

    Increasing
    Clouds

  • Friday

    Friday: Mostly sunny, with a high near 96. Calm wind becoming south around 5 mph in the morning.

    High: 96 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South southeast wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 95. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 95 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. Southeast wind around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 95. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 95 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, then gradually becoming sunny, with a high near 98. Heat index values as high as 105. South wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 97. Heat index values as high as 104. South wind around 5 mph.
Thursday Night
Increasing clouds, with a low around 76. South wind 5 to 10 mph.
Friday
Mostly sunny, with a high near 96. Calm wind becoming south around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 75. South southeast wind around 5 mph.
Saturday
Sunny, with a high near 95. Calm wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 95. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 75.
Monday
Mostly sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 97.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WNW San Marcos TX
 29.88°N 97.97°W (Elev. 699 ft)
Last Update:
6:42 am CDT Aug 5, 2026
Forecast Valid:
9am CDT Aug 5, 2026-6pm CDT Aug 11, 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