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.

Mostly Cloudy

99°F

37°C

Humidity	35%
Wind Speed	SE 8 mph
Barometer	29.89 in (1011.0 mb)
Dewpoint	67°F (19°C)
Visibility	10.00 mi
Heat Index	104°F (40°C)
Last update	29 Aug 4:56 pm CDT

More Information:

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

Extended Forecast for

4 Miles SW San Marcos TX

This Afternoon
High: 99 °F
Slight Chance
T-storms
Tonight
Low: 75 °F
Slight Chance
T-storms
Saturday
High: 97 °F
Mostly Sunny
then Chance
T-storms
Saturday Night
Low: 75 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 91 °F
Chance
Showers then
Chance
T-storms
Sunday Night
Low: 72 °F
Chance
T-storms then
Showers
Likely
Labor Day
High: 87 °F
Showers
Likely
Monday Night
Low: 71 °F
Slight Chance
Showers
Tuesday
High: 93 °F
Mostly Sunny

Detailed Forecast

This Afternoon

A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 99. Heat index values as high as 102. East wind around 5 mph.

Tonight

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. East wind around 5 mph becoming calm after midnight.

Saturday

A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97. Heat index values as high as 105. Calm wind becoming east southeast around 5 mph in the afternoon.

Saturday Night

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

Sunday

A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. Calm wind becoming east northeast around 5 mph in the afternoon.

Sunday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. East northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

Labor Day

Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 87. North wind around 5 mph. Chance of precipitation is 70%.

Monday Night

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

Tuesday

Mostly sunny, with a high near 93. North wind around 5 mph.

Tuesday Night

Mostly clear, with a low around 70.

Wednesday

Mostly sunny, with a high near 92.

Wednesday Night

Mostly clear, with a low around 67.

Thursday

Sunny, with a high near 92.