Dangerous Heat in a Couple of Locations; Active Monsoon

Dangerous heat continues in a couple of locations today. In the Pacific Northwest to the central Valley of California and across the Gulf Coast region from the western Florida Panhandle to eastern Texas. Meanwhile, the monsoon threat of heavy rainfall and flooding will be possible in the Four Corners region and west Texas today, with a more significant threat on Friday in Arizona and New Mexico. Read More >

Hazardous Weather Conditions

En Español

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

83°F

28°C

Humidity	79%
Wind Speed	SW 7 mph
Barometer	30.04 in (1016.0 mb)
Dewpoint	76°F (24°C)
Visibility	10.00 mi
Heat Index	91°F (33°C)
Last update	17 Aug 8:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Today

Hot
High: 99 °F
Tonight

Partly Cloudy
Low: 77 °F
Thursday

Mostly Sunny
then Chance
T-storms
High: 99 °F
Thursday
Night

Chance
T-storms
Low: 73 °F
Friday

Slight Chance
T-storms then
Chance
T-storms
High: 93 °F
Friday
Night

Partly Cloudy
Low: 73 °F
Saturday

Mostly Sunny
then Slight
Chance
T-storms
High: 95 °F
Saturday
Night

Partly Cloudy
Low: 76 °F
Sunday

Partly Sunny
then Slight
Chance
T-storms
High: 94 °F

Detailed Forecast

Today

Mostly sunny and hot, with a high near 99. Heat index values as high as 102. South wind 5 to 10 mph.

Tonight

Partly cloudy, with a low around 77. South southwest wind 5 to 10 mph.

Thursday

A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind around 5 mph becoming southeast in the afternoon.

Thursday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. North northeast wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.

Friday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 93. South wind 5 to 10 mph becoming east southeast in the afternoon.

Friday Night

Partly cloudy, with a low around 73. East southeast wind 5 to 10 mph becoming south after midnight.

Saturday

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. South wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.

Saturday Night

Partly cloudy, with a low around 76. South wind 5 to 15 mph, with gusts as high as 20 mph.

Sunday

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 94. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

Sunday Night

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 76.

Monday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 97.

Monday Night

A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.

Tuesday

A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 95.