Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

Fair

75°F

24°C

Humidity 64%
Wind Speed SE 14 mph
Barometer 30.03 in (1016.3 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 24 Mar 9:56 pm CDT
Detailed forecast for

Hays County

Tonight
Clear this evening, then becoming mostly cloudy. Lows in the lower 60s. South winds 5 to 10 mph.
Wednesday
Mostly cloudy in the morning, then clearing. Highs in the upper 80s. South winds 10 to 15 mph.
Wednesday Night
Clear in the evening, then becoming partly cloudy. Lows in the lower 60s. South winds around 10 mph with gusts up to 20 mph.
Thursday
Partly cloudy in the morning, then clearing. Highs in the upper 80s. South winds 10 to 15 mph with gusts up to 25 mph.
Thursday Night
Clear in the evening, then becoming partly cloudy. Lows in the lower 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Friday And Friday Night
Partly cloudy. Highs in the upper 80s. Lows in the upper 50s.
Saturday
Partly cloudy. Highs around 80.
Saturday Night And Sunday
Mostly clear. Lows in the mid 50s. Highs in the mid 80s.
Sunday Night Through Tuesday
Partly cloudy. Lows in the upper 50s. Highs in the upper 80s.



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414 PM CDT Tue Mar 24 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database