Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

Overcast and Breezy

86°F

30°C

Humidity 53%
Wind Speed SE 21 mph
Barometer 29.93 in (1012.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 14 Apr 4:56 pm CDT
Detailed forecast for

Hays County

Tonight
Mostly cloudy. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Wednesday
Cloudy. A chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent.
Wednesday Night
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy after midnight. Lows in the mid 60s. South winds 5 to 10 mph with gusts up to 20 mph.
Thursday
Mostly cloudy in the morning, then becoming partly cloudy. Highs in the upper 80s. South winds 5 to 10 mph with gusts up to 20 mph.
Thursday Night
Mostly clear in the evening, then becoming mostly cloudy. Lows in the mid 60s.
Friday And Friday Night
Mostly cloudy. Highs in the upper 80s. Lows in the mid 60s.
Saturday
Cloudy. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Cooler with highs in the upper 70s. Chance of rain 50 percent.
Saturday Night
Cloudy. A chance of showers and thunderstorms in the evening, then a slight chance of showers after midnight. Cooler with lows in the lower 50s. Chance of rain 40 percent.
Sunday
Mostly cloudy. A slight chance of showers in the afternoon. Highs in the lower 70s.
Sunday Night
Cloudy with a slight chance of showers. Lows in the mid 50s.
Monday
Cloudy with a slight chance of thunderstorms. A chance of showers. Highs in the upper 60s. Chance of rain 40 percent.



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353 PM CDT Tue Apr 14 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database