Storm Impacting the Southwest U.S.; Above Normal Temperatures Further East

A storm system will shift across the southwest U.S. through Thursday with widespread showers and isolated thunderstorms. Isolated flooding is possible. High-elevation snow is also expected in parts of Nevada and the southern Sierra Nevada range. East of this storm, above average temperatures will challenge or break daily record high temperatures this week in the southern Plains and southeast U.S. 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

80°F

27°C

Humidity	69%
Wind Speed	S 12 mph
Barometer	30.02 in (1015.7 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	18 Nov 11:56 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, 12:00am until November 21, 06:00am

Click here for hazard details and duration

Flood Watch

This Afternoon
High: 84 °F
Partly Sunny
Tonight
Low: 68 °F
Partly Cloudy
then Slight
Chance
Drizzle
Wednesday
High: 84 °F
Chance
Showers
Wednesday Night
Low: 69 °F
Chance
Showers
Thursday
High: 80 °F
Showers
Thursday Night
Low: 66 °F
Showers
Likely
Friday
High: 80 °F
Chance
Showers then
Slight Chance
Showers
Friday Night
Low: 60 °F
Partly Cloudy
then Slight
Chance
Showers
Saturday
High: 75 °F
Chance
Showers

Detailed Forecast

This Afternoon

Partly sunny, with a high near 84. South wind 5 to 10 mph.

Tonight

A slight chance of drizzle after midnight. Increasing clouds, with a low around 68. South southeast wind around 5 mph.

Wednesday

A chance of drizzle before noon, then a chance of showers and thunderstorms after noon. Cloudy, then gradually becoming mostly sunny, 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 69. South southeast wind 5 to 10 mph. Chance of precipitation is 40%.

Thursday

Showers likely, then showers and possibly a thunderstorm after noon. High near 80. South southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

Thursday Night

Showers likely and possibly a thunderstorm before midnight, then a chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 66. East southeast wind 5 to 10 mph becoming south after midnight. Chance of precipitation is 60%.

Friday

A 50 percent chance of showers, mainly before noon. Partly sunny, with a high near 80. South wind around 5 mph becoming north in the afternoon.

Friday Night

A 20 percent chance of showers after midnight. Partly cloudy, with a low around 60. 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 75. Northeast wind 5 to 10 mph.

Saturday Night

A 30 percent chance of showers. Mostly cloudy, with a low around 59.

Sunday

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75.

Sunday Night

A 40 percent chance of showers. Mostly cloudy, with a low around 62.