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

87°F

31°C

Humidity	59%
Wind Speed	E 17 mph
Barometer	29.91 in (1012.2 mb)
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	93°F (34°C)
Last update	29 Aug 6:56 pm CDT

More Information:

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

Extended Forecast for

San Marcos TX

Tonight
Low: 74 °F
Slight Chance
T-storms then
Partly Cloudy
Saturday
High: 98 °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: 71 °F
Chance
T-storms then
Showers
Likely
Labor Day
High: 89 °F
Showers
Likely
Monday Night
Low: 69 °F
Slight Chance
Showers
Tuesday
High: 94 °F
Mostly Sunny
Tuesday Night
Low: 70 °F
Mostly Clear

Detailed Forecast

Tonight

A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 74. East wind 5 to 10 mph becoming light and variable after midnight.

Saturday

A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 98. Heat index values as high as 107. Calm wind becoming 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 calm after midnight. Chance of precipitation is 30%.

Sunday

A chance of showers, with thunderstorms also possible after 7am. Partly sunny, with a high near 91. Heat index values as high as 101. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 40%.

Sunday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. 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 89. Calm wind becoming north northeast around 5 mph in the morning. Chance of precipitation is 70%.

Monday Night

A 20 percent chance of showers. Mostly cloudy, with a low around 69. East northeast wind around 5 mph becoming calm in the evening.

Tuesday

Mostly sunny, with a high near 94. North wind around 5 mph.

Tuesday Night

Mostly clear, with a low around 70. North northeast wind around 5 mph becoming calm in the evening.

Wednesday

Mostly sunny, with a high near 93.

Wednesday Night

Mostly clear, with a low around 68.

Thursday

Sunny, with a high near 93.