Current conditions at
San Marcos, San Marcos Municipal Airport (KHYI)
Lat: 29.89°NLon: 97.86°WElev: 597ft.
Fair
85°F
29°C
| Humidity | 72% |
| Wind Speed | S 10 mph |
| Barometer | 30.18 in (1021.0 mb) |
| Dewpoint | 75°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 93°F (34°C) |
| Last update | 16 Sep 10:56 pm CDT |
Extended Forecast for
3 Miles NW San Marcos TX
Tonight
Low: 75 °F
Partly Cloudy
Thursday
High: 97 °F
Partly Sunny
then Slight
Chance
T-stormsThursday Night
Low: 73 °F
Slight Chance
T-storms then
Partly CloudyFriday
High: 97 °F
Sunny
Friday Night
Low: 72 °F
Mostly Clear
Saturday
High: 97 °F
Sunny
Saturday Night
Low: 72 °F
Mostly Clear
Sunday
High: 97 °F
Mostly Sunny
Sunday Night
Low: 73 °F
Partly Cloudy
Detailed Forecast
Tonight
Partly cloudy, with a low around 75. South southeast wind 5 to 10 mph becoming light and variable after midnight.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 97. Heat index values as high as 103. Light northeast wind becoming east 5 to 10 mph in the morning.
Thursday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 73. East wind 5 to 10 mph becoming light and variable in the evening.
Friday
Sunny, with a high near 97. Heat index values as high as 101. Light east wind becoming east southeast 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 72. East southeast wind around 5 mph becoming calm after midnight.
Saturday
Sunny, with a high near 97. Calm wind becoming south southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 72. Southeast wind around 5 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 97. Calm wind becoming south around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 73. South southeast wind around 5 mph becoming calm after midnight.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Monday Night
A 20 percent chance of showers. Mostly clear, with a low around 73.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
3 Miles NW San Marcos TX
29.9°N 97.97°W (Elev. 686 ft)
29.9°N 97.97°W (Elev. 686 ft)
10:44 pm CDT Sep 16, 2026
11pm CDT Sep 16, 2026-6pm CDT Sep 23, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
