Remnants of Arthur and Heavy Rainfall Across the South; Severe Weather for the East

Potential life threatening flash flooding across the northern Gulf Coast states as the remnants of Arthur track across the area. Remember, turn around - don't drown. In addition, severe thunderstorms with tornadoes are possible with the circulation of this storm. The threat for more severe thunderstorms will occur across portions of the Northeast, mid-Atlantic and central Appalachian's. Read More >

Hazardous Weather Conditions

Extreme Heat Warning in effect from June 18, 12:00 PM CDT until June 18, 08:00 PM CDT

Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

Fair with Haze

97°F

36°C

Humidity	62%
Wind Speed	SE 13 mph
Barometer	29.68 in (1004.0 mb)
Dewpoint	82°F (28°C)
Visibility	5.00 mi
Heat Index	121°F (49°C)
Last update	18 Jun 3:56 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

Extreme Heat Warning until June 18, 08:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning until June 18, 08:00pm
NOW until 8:00pm Thu
Extreme Heat Warning
This Afternoon
High: 98 °F
Sunny
Tonight
Low: 79 °F
Increasing
Clouds
Juneteenth
High: 93 °F
Mostly Cloudy
then Chance
T-storms
Friday Night
Low: 77 °F
Chance
T-storms
Saturday
High: 91 °F
Slight Chance
T-storms then
Chance
T-storms
Saturday Night
Low: 77 °F
Chance
T-storms
Sunday
High: 93 °F
Mostly Sunny
Sunday Night
Low: 78 °F
Mostly Clear

Detailed Forecast

This Afternoon

Sunny, with a high near 98. Heat index values as high as 116. South southeast wind around 10 mph, with gusts as high as 20 mph.

Tonight

Increasing clouds, with a low around 79. Southeast wind 10 to 15 mph, with gusts as high as 20 mph.

Juneteenth

A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly cloudy, with a high near 93. Heat index values as high as 106. East southeast wind 5 to 10 mph.

Friday Night

A 40 percent chance of showers and thunderstorms, mainly after 7pm. Mostly cloudy, with a low around 77. South southeast wind 5 to 10 mph.

Saturday

A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. South southeast wind 5 to 10 mph.

Saturday Night

A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 77. Southeast wind 5 to 10 mph.

Sunday

Mostly sunny, with a high near 93. South wind 10 to 15 mph, with gusts as high as 25 mph.

Sunday Night

Mostly clear, with a low around 78. South southeast wind around 15 mph, with gusts as high as 25 mph.

Monday

Mostly sunny, with a high near 95. South wind 10 to 15 mph, with gusts as high as 25 mph.