Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

Fair

84°F

29°C

Humidity 53%
Wind Speed SE 7 mph
Barometer 29.96 in (1013.9 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 15 Oct 6:56 pm CDT
Detailed forecast for

Hays County

Tonight
Mostly clear this evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Breezy with lows in the lower 60s. East winds around 5 mph, increasing to north 20 to 25 mph with gusts up to 35 mph after midnight. Chance of rain 40 percent.
Friday
Mostly cloudy in the morning, then becoming partly cloudy. Windy and much cooler. Less humid with highs in the mid 60s. North winds 20 to 30 mph with gusts up to 45 mph.
Friday Night
Mostly clear. Much cooler with lows in the upper 40s. North winds 15 to 20 mph with gusts up to 40 mph.
Saturday
Mostly sunny. Highs in the upper 60s. North winds 15 to 20 mph with gusts up to 30 mph, diminishing to 5 to 10 mph with gusts up to 20 mph in the afternoon.
Saturday Night
Mostly clear. Lows in the mid 40s. North winds around 5 mph.
Sunday And Sunday Night
Mostly clear. Highs in the lower 70s. Lows around 50.
Monday Through Tuesday Night
Partly cloudy. Highs in the upper 70s. Lows in the upper 50s.
Wednesday
Partly cloudy in the morning, then becoming mostly sunny. Highs in the mid 80s.
Wednesday Night
Mostly clear. Lows in the lower 60s.
Thursday
Partly cloudy. Highs in the upper 80s.



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401 PM CDT Thu Oct 15 2026
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database