Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

Overcast

71°F

22°C

Humidity 81%
Wind Speed S 9 mph
Barometer 30.05 in (1016.7 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 25 Mar 3:56 am CDT
Detailed forecast for

Hays County

Today
Mostly cloudy this morning, then clearing. Highs in the upper 80s. South winds 5 to 10 mph with gusts up to 20 mph.
Tonight
Clear in the evening, then becoming mostly cloudy. Lows in the lower 60s. South winds around 10 mph with gusts up to 20 mph.
Thursday
Mostly 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
Partly cloudy in the morning, then clearing. Highs in the upper 80s. South winds 5 to 10 mph, becoming southeast in the afternoon.
Friday Night And Saturday
Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.
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 lower 60s. Highs in the upper 80s.



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409 AM CDT Wed Mar 25 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database