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 19%
Wind Speed S 8 mph
Barometer 30.36 in (1028.2 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 17 Mar 10:56 am CDT
Detailed forecast for

Hays County

Today
Mostly sunny. Not as cool with highs in the mid 60s. South winds 5 to 10 mph with gusts up to 25 mph.
Tonight
Mostly clear. Not as cool with lows in the mid 40s. South winds 5 to 10 mph with gusts up to 25 mph.
Wednesday
Mostly sunny. Not as cool with highs in the upper 70s. South winds 5 to 10 mph with gusts up to 20 mph.
Wednesday Night
Clear. Lows around 50. South winds 5 to 10 mph.
Thursday
Sunny. Highs in the mid 80s. Southwest winds 5 to 10 mph.
Thursday Night Through Sunday
Clear. Lows in the upper 50s. Highs in the lower 90s.
Sunday Night And Monday
Mostly clear. Lows in the upper 50s. Highs in the upper 80s.



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258 AM 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