Flooding Threat Along the Gulf Coast, Southern Rockies and High Plains; Cooler Weather in the Central and Eastern U.S.

Strong thunderstorms may bring excessive rainfall and flooding over parts of the northern Gulf Coast today and over parts of the southern Rockies into the High Plains today through the weekend. A refreshingly cool and dry air mass will continue to produce below average temperatures across the central and eastern U.S. through the weekend. Read More >

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

91°F

33°C

Humidity	56%
Wind Speed	SW 13 G 21 mph
Barometer	30.00 in (1015.0 mb)
Dewpoint	73°F (23°C)
Visibility	10.00 mi
Heat Index	100°F (38°C)
Last update	29 Aug 10:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Today
High: 99 °F
Hot
Tonight
Low: 75 °F
Mostly Cloudy
Saturday
High: 98 °F
Partly Sunny
then Chance
T-storms
Saturday Night
Low: 75 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 92 °F
Showers
Likely
Sunday Night
Low: 73 °F
Chance
T-storms
Labor Day
High: 89 °F
Chance
T-storms
Monday Night
Low: 71 °F
Slight Chance
Showers
Tuesday
High: 94 °F
Sunny then
Slight Chance
T-storms

Detailed Forecast

Today

Mostly sunny and hot, with a high near 99. Heat index values as high as 105. South southeast wind around 5 mph.

Tonight

Mostly cloudy, with a low around 75. East wind around 5 mph becoming south after midnight.

Saturday

A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 98. Heat index values as high as 103. Calm wind becoming east southeast around 5 mph in the afternoon.

Saturday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 75. East wind around 5 mph becoming south southeast after midnight. Chance of precipitation is 30%.

Sunday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 92. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 60%.

Sunday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. East northeast wind around 5 mph becoming calm in the evening.

Labor Day

A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. North northeast wind around 5 mph.

Monday Night

A 20 percent chance of showers. Partly cloudy, with a low around 71. Northeast wind around 5 mph becoming calm in the evening.

Tuesday

A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Calm wind becoming north around 5 mph in the morning.

Tuesday Night

Partly cloudy, with a low around 71.

Wednesday

Mostly sunny, with a high near 93.