News Headlines
Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
76°F
24°C
| Humidity | 91% |
| Wind Speed | SE 5 mph |
| Barometer | 29.95 in (1013.4 mb) |
| Dewpoint | 73°F (23°C) |
| Visibility | 10.00 mi |
| Heat Index | 76°F (24°C) |
| Last update | 5 Sep 1:56 am CDT |
Extended Forecast for
San Marcos TX
Overnight
Low: 76 °F
Mostly Cloudy
Saturday
High: 97 °F
Mostly Sunny
Saturday Night
Low: 75 °F
Partly Cloudy
Sunday
High: 96 °F
Mostly Sunny
then Slight
Chance
T-stormsSunday Night
Low: 75 °F
Partly Cloudy
Labor Day
High: 98 °F
Mostly Sunny
Monday Night
Low: 75 °F
Mostly Clear
Tuesday
High: 97 °F
Sunny
Tuesday Night
Low: 75 °F
Mostly Clear
Detailed Forecast
Overnight
Mostly cloudy, with a low around 76. South wind around 5 mph becoming calm.
Saturday
Mostly 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
Partly cloudy, with a low around 75. East southeast wind 5 to 10 mph becoming light and variable after midnight.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Heat index values as high as 104. Calm wind becoming east around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 75. East southeast wind around 5 mph becoming south southwest after midnight.
Labor Day
Mostly sunny, with a high near 98. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 75. Southeast wind around 5 mph becoming calm after midnight.
Wednesday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 96. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
Mostly sunny, with a high near 96.
Thursday Night
Mostly clear, with a low around 75.
Friday
Mostly sunny, with a high near 97.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
San Marcos TX
29.88°N 97.94°W (Elev. 577 ft)
29.88°N 97.94°W (Elev. 577 ft)
2:42 am CDT Sep 5, 2026
2am CDT Sep 5, 2026-6pm CDT Sep 11, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
