Storm Impacting the Southwest U.S.

A slow moving weather disturbance will continue to bring periodic rain showers, a few isolated thunderstorms, and a localized flash flooding across the Southwest. The threat will expand into the Southern Plains Wednesday night. Moderate to heavy snow across the Sierra Nevada and southern Utah Ranges will continue into the overnight period. Read More >

Hazardous Weather Conditions

Flood Watch in effect from November 20, 12:00 AM CST 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

73°F

23°C

Humidity	87%
Wind Speed	S 10 mph
Barometer	30.06 in (1017.4 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Last update	18 Nov 10:56 pm 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, 12:00am until November 21, 06:00am

Click here for hazard details and duration

Flood Watch

Tonight
Low: 69 °F
Slight Chance
Drizzle
Wednesday
High: 84 °F
Chance
T-storms then
Chance
Showers
Wednesday Night
Low: 70 °F
Slight Chance
T-storms then
Chance
Showers
Thursday
High: 81 °F
Showers
Likely
Thursday Night
Low: 66 °F
Showers
Likely
Friday
High: 80 °F
Chance
Showers then
Slight Chance
Showers
Friday Night
Low: 61 °F
Slight Chance
Showers then
Partly Cloudy
Saturday
High: 78 °F
Chance
Showers
Saturday Night
Low: 61 °F
Chance
Showers then
Chance
T-storms

Detailed Forecast

Tonight

A slight chance of drizzle after midnight. Increasing clouds, with a low around 69. South wind around 5 mph.

Wednesday

A chance of drizzle and thunderstorms before noon, then a chance of showers and thunderstorms, mainly between noon and 3pm. Mostly cloudy, with a high near 84. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Wednesday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.

Thursday

Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 81. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

Thursday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Southeast wind 5 to 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 70%.

Friday

A chance of showers and thunderstorms. Partly sunny, with a high near 80. Southwest wind around 5 mph becoming north in the afternoon. Chance of precipitation is 50%.

Friday Night

A 20 percent chance of showers before midnight. Partly cloudy, with a low around 61. Calm wind becoming north around 5 mph after midnight.

Saturday

A 30 percent chance of showers, mainly after noon. Mostly sunny, with a high near 78. East northeast wind 5 to 10 mph.

Saturday Night

A chance of showers, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 61. East northeast wind around 5 mph. Chance of precipitation is 50%.

Sunday

Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.

Sunday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.

Monday

Showers likely. Partly sunny, with a high near 74. Chance of precipitation is 60%.

Monday Night

A 30 percent chance of showers. Partly cloudy, with a low around 54.

Tuesday

A 20 percent chance of showers. Sunny, with a high near 72.