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.

Overcast

82°F

28°C

Humidity	82%
Wind Speed	S 12 mph
Barometer	29.90 in (1011.8 mb)
Dewpoint	76°F (24°C)
Visibility	10.00 mi
Heat Index	89°F (32°C)
Last update	11 Jun 9:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Today
High: 92 °F
Decreasing
Clouds
Tonight
Low: 77 °F
Partly Cloudy
Friday
High: 92 °F
Mostly Cloudy
then Slight
Chance
T-storms
Friday Night
Low: 75 °F
Partly Cloudy
Saturday
High: 93 °F
Mostly Sunny
Saturday Night
Low: 76 °F
Partly Cloudy
Sunday
High: 92 °F
Partly Sunny
then Showers
Likely
Sunday Night
Low: 75 °F
Chance
T-storms
Monday
High: 89 °F
Showers
Likely

Detailed Forecast

Today

Cloudy, then gradually becoming mostly sunny, with a high near 92. Heat index values as high as 103. South wind 10 to 15 mph, with gusts as high as 20 mph.

Tonight

Partly cloudy, with a low around 77. South southeast wind 5 to 15 mph, with gusts as high as 20 mph.

Friday

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92. Heat index values as high as 102. Southeast wind 5 to 10 mph.

Friday Night

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

Saturday

Mostly sunny, with a high near 93. 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 15 mph, with gusts as high as 20 mph.

Sunday

Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 92. South southeast wind around 5 mph. Chance of precipitation is 60%.

Sunday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. South southeast wind 5 to 10 mph.

Monday

Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. South wind around 5 mph. 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

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.

Tuesday Night

A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.

Wednesday

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