Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89° N Lon: 97.86° W Elev: 597 ft.

Fair

52°F

11°C

Humidity 41%
Wind Speed S 12 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 17 Mar 10:56 pm CDT
Detailed forecast for

Hays County

Tonight
Mostly clear. Not as cool with lows in the lower 40s. South winds 5 to 10 mph with gusts up to 20 mph.
Wednesday
Sunny. Not as cool with highs in the upper 70s. Southwest winds 5 to 10 mph with gusts up to 20 mph.
Wednesday Night
Clear. Lows around 50. South winds around 5 mph.
Thursday
Sunny. Highs in the mid 80s. Southwest winds 5 to 10 mph.
Thursday Night
Clear. Lows in the mid 50s. Southwest winds around 5 mph.
Friday Through Sunday Night
Clear. Highs in the lower 90s. Lows around 60.
Monday And Monday Night
Mostly clear. Highs in the upper 80s. Lows in the upper 50s.
Tuesday
Partly cloudy in the morning, then clearing. Highs in the lower 80s.



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454 PM CDT Tue Mar 17 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database