Severe Thunderstorm and Flash Flooding Threats in the South

Organized severe thunderstorms capable of producing mainly large hail and perhaps damaging winds are expected across portions of Louisiana this afternoon with a second round further west tonight. Heavy thunderstorms may lead to flash flooding over portions of the northern Gulf Coast today through Saturday. Several inches of excessive rainfall are possible with Flash Flood Watches in effect. Read More >

En Español

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

82°F

28°C

Humidity	56%
Wind Speed	NE 14 mph
Barometer	29.94 in (1013.0 mb)
Dewpoint	65°F (18°C)
Visibility	10.00 mi
Heat Index	84°F (29°C)
Last update	13 Apr 1:56 pm CDT

More Information:

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

Extended Forecast for

3 Miles WNW San Marcos TX

This
Afternoon

Slight Chance
Showers
High: 78 °F
Tonight

Chance
T-storms
Low: 65 °F
Wednesday

Chance
T-storms
High: 79 °F
Wednesday
Night

Chance
T-storms
Low: 59 °F
Thursday

Chance
T-storms
High: 71 °F
Thursday
Night

Chance
T-storms
Low: 62 °F
Friday

Chance
T-storms
High: 79 °F
Friday
Night

Chance
T-storms
Low: 53 °F
Saturday

Chance
Showers
High: 65 °F

Detailed Forecast

This Afternoon

A 20 percent chance of showers. Partly sunny, with a high near 78. North northeast wind around 10 mph.

Tonight

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. North northeast wind 5 to 10 mph.

Wednesday

A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 79. North northeast wind 5 to 10 mph.

Wednesday Night

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. North northeast wind around 10 mph.

Thursday

A 40 percent chance of showers and thunderstorms, mainly after 1pm. Cloudy, with a high near 71. North northeast wind around 10 mph, with gusts as high as 20 mph.

Thursday Night

A 30 percent chance of showers and thunderstorms, mainly after 1am. Cloudy, with a low around 62. East northeast wind 5 to 10 mph.

Friday

A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 79. East wind around 5 mph becoming southwest in the afternoon.

Friday Night

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53. North wind 5 to 15 mph, with gusts as high as 25 mph.

Saturday

A 30 percent chance of showers. Mostly cloudy, with a high near 65. North northeast wind 15 to 20 mph, with gusts as high as 25 mph.

Saturday Night

A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 49.

Sunday

A 20 percent chance of showers. Partly sunny, with a high near 67.