Severe Thunderstorms in the Southern Plains; Heavy to Excessive Rainfall in South Central Texas

Widespread rain may produce flash flooding across the Southern Plains into the Ozarks today. Numerous instances of flash flooding are expected in south-central Texas, including the Hill Country. There will also be a risk of isolated severe thunderstorms across the southern Plains today, where an instance or two of severe wind, hail, or a brief tornado may occur. Read More >

Hazardous Weather Conditions

Flood Watch until November 21, 06:00 AM CST

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

76°F

24°C

Humidity	82%
Wind Speed	S 15 mph
Barometer	30.03 in (1016.1 mb)
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Heat Index	77°F (25°C)
Last update	20 Nov 8:56 am CST

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

San Marcos TX

Flood Watch November 20, 09:08am until November 21, 06:00am

Click here for hazard details and duration

Flood Watch

Flood Watch November 20, 09:08am until November 21, 06:00am
NOW until 6:00am Fri
Flood Watch
Today
High: 81 °F
Chance
Showers then
Chance
T-storms
Tonight
Low: 67 °F
Showers
Likely then
Chance
T-storms
Friday
High: 80 °F
Chance
Showers then
Slight Chance
Showers
Friday Night
Low: 63 °F
Slight Chance
T-storms then
Chance
Showers
Saturday
High: 78 °F
Chance
Showers
Saturday Night
Low: 64 °F
Chance
Showers
Sunday
High: 78 °F
Chance
Showers
Sunday Night
Low: 63 °F
Chance
T-storms

Detailed Forecast

Today

A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 81. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.

Tonight

Showers likely and possibly a thunderstorm before 9pm, then a chance of showers and thunderstorms after 9pm. Increasing clouds, with a low around 67. South southeast wind 5 to 10 mph becoming northeast in the evening. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

Friday

A chance of showers and thunderstorms before noon, then a slight chance of showers. Cloudy, then gradually becoming mostly sunny, with a high near 80. South southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night

A slight chance of showers and thunderstorms before 9pm, then a slight chance of showers between 9pm and midnight, then a chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 63. Calm wind becoming north around 5 mph after midnight. Chance of precipitation is 30%.

Saturday

A 30 percent chance of showers. Partly sunny, with a high near 78. East northeast wind 5 to 10 mph, with gusts as high as 20 mph.

Saturday Night

A 40 percent chance of showers. Mostly cloudy, with a low around 64. East northeast wind around 5 mph.

Sunday

A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

Sunday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South southeast wind around 10 mph, with gusts as high as 20 mph.

Monday

Showers likely and possibly a thunderstorm before noon, then a chance of showers. Partly sunny, with a high near 74. South southwest wind 5 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

Monday Night

A 20 percent chance of showers before midnight. Mostly clear, with a low around 52.

Tuesday

Sunny, with a high near 75.

Tuesday Night

Mostly clear, with a low around 52.

Wednesday

Mostly sunny, with a high near 70.