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 37%
Wind Speed NE 10 mph
Barometer 30.00 in (1015.3 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 27 Feb 12:56 pm CST
Detailed forecast for

Caldwell County

This Afternoon
Sunny. Highs in the mid 80s. East winds 5 to 10 mph.
Tonight
Clear. Patchy fog after midnight. Lows in the mid 50s. Southeast winds around 5 mph.
Saturday
Partly cloudy in the morning, then becoming sunny. Patchy fog in the morning. Highs in the mid 80s. South winds 10 to 15 mph.
Saturday Night
Clear in the evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the upper 50s. South winds 5 to 10 mph.
Sunday
Mostly cloudy in the morning, then clearing. Patchy fog in the morning. Highs in the mid 80s. South winds 10 to 15 mph with gusts up to 25 mph.
Sunday Night Through Monday Night
Partly cloudy. Lows in the lower 60s. Highs in the mid 80s.
Tuesday
Mostly cloudy in the morning, then becoming partly cloudy. Highs in the mid 80s.
Tuesday Night
Partly cloudy in the evening, then cloudy with a slight chance of showers after midnight. Lows in the mid 60s.
Wednesday And Wednesday Night
Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Highs in the mid 80s. Lows in the mid 60s. Chance of rain 40 percent.
Thursday
Mostly cloudy with a chance of showers in the morning, then partly cloudy with a slight chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent.



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1252 PM CST Fri Feb 27 2026
 
 

Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database