Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

A Few Clouds

70°F

21°C

Humidity 82%
Wind Speed S 9 mph
Barometer 29.99 in (1014.9 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 31 Mar 11:56 pm CDT
Detailed forecast for

Hays County

Tonight
Mostly clear this evening, then becoming cloudy. Lows in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Wednesday
Mostly cloudy in the morning, then becoming partly cloudy. Highs in the upper 80s. South winds 15 to 20 mph with gusts up to 30 mph.
Wednesday Night
Partly cloudy in the evening, then cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 60s. South winds 15 to 20 mph with gusts up to 35 mph. Chance of rain 40 percent.
Thursday
Mostly cloudy with a chance of thunderstorms. Showers likely, mainly in the morning. Highs in the lower 80s. South winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 70 percent.
Thursday Night
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then cloudy after midnight. Lows in the upper 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Friday
Mostly cloudy. A slight chance of showers in the afternoon. Highs in the mid 80s.
Friday Night
Cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 40 percent.
Saturday
Cloudy with showers likely with a slight chance of thunderstorms. Cooler with highs in the mid 70s. Chance of rain 70 percent.
Saturday Night
Cloudy with a 50 percent chance of showers. Cooler with lows in the lower 50s.
Sunday
Cloudy with a 40 percent chance of showers. Cooler with highs in the mid 60s.
Sunday Night
Mostly cloudy. A slight chance of showers in the evening. Lows in the upper 40s.
Monday
Partly cloudy. Highs in the upper 60s.
Monday Night
Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 40s.
Tuesday
Partly cloudy. Highs in the lower 70s.



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410 PM CDT Tue Mar 31 2026
 
 

Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database