Dangerous Heat Builds and Expands; Critical Fire Weather for the Southwest; Severe Thunderstorms for Plains and Midwest

Dangerous to record breaking heat will build across the center of the nation and slowly build eastward this week. Wildfire conditions remain critical for the Southwest and portions of the Great Basin through Monday. For the northern Plains and upper Midwest, severe thunderstorms with the potential for large to very large hail and severe winds are the primary hazards. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Overcast

79°F

26°C

Humidity	85%
Wind Speed	S 9 mph
Barometer	29.96 in (1013.8 mb)
Dewpoint	74°F (23°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	28 Jun 6:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Today
High: 95 °F
Becoming
Sunny
Tonight
Low: 77 °F
Increasing
Clouds
Monday
High: 96 °F
Becoming
Sunny
Monday Night
Low: 75 °F
Increasing
Clouds
Tuesday
High: 95 °F
Mostly Sunny
Tuesday Night
Low: 75 °F
Mostly Clear
Wednesday
High: 95 °F
Mostly Sunny
Wednesday Night
Low: 75 °F
Mostly Clear
Thursday
High: 96 °F
Partly Sunny
then Slight
Chance
T-storms

Detailed Forecast

Today

Mostly cloudy through mid morning, then gradual clearing, with a high near 95. Heat index values as high as 104. South wind 10 to 15 mph, with gusts as high as 25 mph.

Tonight

Increasing clouds, with a low around 77. South southeast wind 10 to 15 mph, with gusts as high as 30 mph.

Monday

Partly sunny, then gradually becoming sunny, with a high near 96. Heat index values as high as 100. South wind 10 to 15 mph, with gusts as high as 30 mph.

Monday Night

Increasing clouds, with a low around 75. South southeast wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 30 mph.

Tuesday

Mostly sunny, with a high near 95. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Tuesday Night

Mostly clear, with a low around 75. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.

Wednesday

Mostly sunny, with a high near 95. South wind 5 to 10 mph, with gusts as high as 20 mph.

Wednesday Night

Mostly clear, with a low around 75. South southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Thursday

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96. Light south wind becoming south southeast 5 to 10 mph in the morning.

Thursday Night

Mostly clear, with a low around 75.

Friday

Mostly sunny, with a high near 96.

Friday Night

Mostly clear, with a low around 75.

Independence Day

Mostly sunny, with a high near 97.