Severe Thunderstorms, Excessive Rain and Heat Hazards

A Moderate Risk of severe thunderstorms (level 4 of 5) is in the outlook across portions of the Midwest today. Damaging winds, a few tornadoes and frequent lightning with heavy rainfall are in the forecast. Meanwhile, dangerous heat across the southern Plains into the Great Lakes, mid-Atlantic and Northeast will expand into Friday. Risk for wildfires for the central Rockies and Sacramento Valley. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

92°F

33°C

Humidity	62%
Wind Speed	S 16 mph
Barometer	29.87 in (1010.5 mb)
Dewpoint	77°F (25°C)
Visibility	10.00 mi
Heat Index	106°F (41°C)
Last update	11 Jun 1:56 pm CDT

More Information:

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

Extended Forecast for

San Marcos TX

This Afternoon
High: 92 °F
Mostly Sunny
Tonight
Low: 77 °F
Partly Cloudy
then Slight
Chance
Showers
Friday
High: 92 °F
Slight Chance
Showers then
Slight Chance
T-storms
Friday Night
Low: 75 °F
Partly Cloudy
Saturday
High: 91 °F
Partly Sunny
then Slight
Chance
T-storms
Saturday Night
Low: 76 °F
Partly Cloudy
Sunday
High: 91 °F
Partly Sunny
then Chance
T-storms
Sunday Night
Low: 74 °F
Showers
Likely
Monday
High: 89 °F
T-storms
Likely

Detailed Forecast

This Afternoon

Mostly sunny, with a high near 92. Heat index values as high as 102. South southeast wind around 10 mph, with gusts as high as 20 mph.

Tonight

A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 77. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

Friday

A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 92. Heat index values as high as 101. Southeast wind 5 to 10 mph. Chance of precipitation is 20%.

Friday Night

Partly cloudy, with a low around 75. South wind 5 to 10 mph.

Saturday

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Saturday Night

Partly cloudy, with a low around 76. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Sunday

A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Southeast wind around 5 mph.

Sunday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 74. East southeast wind 5 to 10 mph becoming light south after midnight. Chance of precipitation is 60%.

Monday

Showers and thunderstorms likely, mainly after 1pm. Mostly cloudy, with a high near 89. Calm wind becoming east around 5 mph in the morning. Chance of precipitation is 70%.

Monday Night

Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.

Tuesday

Showers and thunderstorms likely. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.

Tuesday Night

A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

Wednesday

A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.