Heat Wave Across the Central and Southeast US; Flash Flood Threats in the North-Central US, Southeast, and Guam

Dangerous heat is expected across portions of the Central and Southeast U.S. through July. Heavy rains, flash flooding & severe weather are possible across the middle Missouri River Valley and Upper Midwest to the upper Great Lakes. Heavy rains and flash flooding are also possible across portions of the Southeast. A tropical disturbance brings heavy rain to Guam & the Marianas through Saturday. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

96°F

36°C

Humidity	44%
Wind Speed	SE 13 G 18 mph
Barometer	30.02 in (1015.5 mb)
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	103°F (39°C)
Last update	23 Jul 2:56 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: 97 °F
Sunny
Tonight
Low: 73 °F
Mostly Clear
Thursday
High: 99 °F
Hot
Thursday Night
Low: 73 °F
Mostly Clear
Friday
High: 96 °F
Mostly Sunny
Friday Night
Low: 76 °F
Mostly Cloudy
Saturday
High: 90 °F
Slight Chance
Showers then
Chance
T-storms
Saturday Night
Low: 75 °F
Mostly Cloudy
Sunday
High: 93 °F
Partly Sunny
then Slight
Chance
T-storms

Detailed Forecast

This Afternoon

Sunny, with a high near 97. Heat index values as high as 103. South wind around 10 mph.

Tonight

Mostly clear, with a low around 73. South southeast wind 5 to 10 mph.

Thursday

Partly sunny, then gradually becoming sunny and hot, with a high near 99. South wind around 5 mph.

Thursday Night

Mostly clear, with a low around 73. Southeast wind around 5 mph becoming southwest after midnight.

Friday

Mostly sunny, with a high near 96. Calm wind becoming southeast around 5 mph in the afternoon.

Friday Night

Mostly cloudy, with a low around 76. South southeast wind around 5 mph.

Saturday

A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. South wind around 5 mph. Chance of precipitation is 40%.

Saturday Night

Mostly cloudy, with a low around 75. South wind around 5 mph.

Sunday

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 93. South wind 5 to 10 mph.

Sunday Night

Partly cloudy, with a low around 75.

Monday

Mostly sunny, with a high near 95.

Monday Night

Partly cloudy, with a low around 73.

Tuesday

Sunny, with a high near 96.