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Severe Thunderstorms and Heavy Rain in Upper Midwest

A slow moving frontal boundary from the central Pains to the Upper Midwest will bring a potential for severe thunderstorms and heavy rain. Rain amounts of 1-3 inches, with locally heavier amounts can be expected. The threat of severe weather moves into the Ohio Valley and Northeast on Tuesday. Monsoon moisture continues to bring the threat of flash flooding to the Southwest and southern Rockies. Read More >

Hazardous Weather Conditions

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

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

Overcast

81°F

27°C

Humidity 79%
Wind Speed S 6 mph
Barometer 30.07 in (1030.0 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 21 Aug 2:15 am CDT
Detailed forecast for

Hays County

Tonight
Clear until early morning then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph.
Monday
Partly cloudy. Highs in the mid 90s. Southeast winds 5 to 10 mph. Highest heat index readings around 106.
Monday Night
Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph.
Tuesday
Partly cloudy. Highs in the mid 90s. South winds 5 to 10 mph.
Tuesday Night
Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph.
Wednesday
Partly cloudy with a 20 percent chance of showers and thunderstorms. Highs in the mid 90s.
Wednesday Night
Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows in the lower 70s.
Thursday And Thursday Night
Mostly cloudy with a 30 percent chance of showers and thunderstorms. Highs in the lower 90s. Lows in the lower 70s.
Friday
Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs in the lower 90s.
Friday Night
Mostly cloudy with a 20 percent chance of showers and thunderstorms. Lows in the lower 70s.
Saturday
Partly cloudy in the morning then becoming mostly cloudy. A 30 percent chance of showers and thunderstorms. Highs in the lower 90s.
Saturday Night
Mostly cloudy before midnight then becoming partly cloudy. A 20 percent chance of showers and thunderstorms. Lows in the lower 70s.
Sunday
Partly cloudy in the morning then becoming mostly cloudy. A 30 percent chance of showers and thunderstorms. Highs in the mid 90s.



Click Map For Forecast
247 PM CDT Sun Aug 20 2017
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database