Heat Continues in the Northeast and Northwest U.S.; Areas of Flash Flooding In the Ohio Valley and Southwest

Dangerous heat will continue to impact portions of the interior Northwest and Northeast U.S. Some relief is expected by Wednesday for the Northeast. Monsoon showers and thunderstorms may result in flash flooding and debris flows from the Four Corners region into the Great Basin this week. Thunderstorms, some severe, may produce excessive rainfall from the Ohio Valley to the Central Appalachians. Read More >

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Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair

90°F

32°C

Humidity	50%
Wind Speed	SE 8 mph
Barometer	29.98 in (1014.0 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Heat Index	95°F (35°C)
Last update	9 Aug 8:56 pm CDT

More Information:

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

Extended Forecast for

2 Miles WNW San Marcos Municipal Airport TX

Tonight

Mostly Clear
Low: 76 °F
Wednesday

Sunny then
Slight Chance
T-storms
High: 99 °F
Wednesday
Night

Slight Chance
T-storms
Low: 76 °F
Thursday

Slight Chance
T-storms then
Chance
T-storms
High: 97 °F
Thursday
Night

Chance
T-storms
Low: 75 °F
Friday

Chance
T-storms
High: 96 °F
Friday
Night

Slight Chance
T-storms
Low: 75 °F
Saturday

Chance
T-storms
High: 93 °F
Saturday
Night

Partly Cloudy
Low: 75 °F

Detailed Forecast

Tonight

Mostly clear, with a low around 76. South wind 5 to 10 mph, with gusts as high as 20 mph.

Wednesday

A 20 percent chance of showers and thunderstorms after 4pm. Sunny and hot, with a high near 99. Heat index values as high as 104. Light and variable wind becoming south southwest 5 to 10 mph in the morning.

Wednesday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76. North wind 5 to 10 mph becoming south after midnight. Winds could gust as high as 20 mph.

Thursday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 97. Heat index values as high as 102. Calm wind becoming west southwest around 5 mph in the morning.

Thursday Night

A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 75. Southeast wind around 5 mph becoming calm after midnight.

Friday

A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96. Calm wind becoming east around 5 mph in the morning. Winds could gust as high as 20 mph.

Friday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. East southeast wind 5 to 10 mph becoming light south southeast after midnight.

Saturday

A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 93. Calm wind becoming east southeast around 5 mph in the morning. Winds could gust as high as 20 mph.

Saturday Night

Partly cloudy, with a low around 75. East southeast wind around 5 mph becoming calm after midnight. Winds could gust as high as 20 mph.

Sunday

A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 97.

Sunday Night

Mostly clear, with a low around 75.

Monday

Sunny and hot, with a high near 99.

Monday Night

Mostly clear, with a low around 75.

Tuesday

Sunny and hot, with a high near 100.