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.

Fog/Mist

82°F

28°C

Humidity	88%
Wind Speed	S 13 mph
Barometer	29.71 in (1005.4 mb)
Dewpoint	78°F (26°C)
Visibility	5.00 mi
Heat Index	91°F (33°C)
Last update	18 Jun 9:56 am CDT

More Information:

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

Extended Forecast for

San Marcos TX

Extreme Heat Warning June 18, 12:00pm until June 18, 08:00pm

Click here for hazard details and duration

Extreme Heat Warning

Today
High: 97 °F
Mostly Sunny
Tonight
Low: 79 °F
Increasing
Clouds
Juneteenth
High: 94 °F
Mostly Cloudy
then Slight
Chance
T-storms
Friday Night
Low: 78 °F
Chance
T-storms
Saturday
High: 91 °F
Chance
T-storms then
Showers
Likely
Saturday Night
Low: 77 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 94 °F
Mostly Sunny
Sunday Night
Low: 77 °F
Partly Cloudy
Monday
High: 94 °F
Mostly Sunny

Detailed Forecast

Today

Mostly sunny, with a high near 97. Heat index values as high as 114. South wind around 10 mph, with gusts as high as 20 mph.

Tonight

Increasing clouds, with a low around 79. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Juneteenth

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 94. Heat index values as high as 109. Southeast wind 5 to 10 mph, with gusts as high as 20 mph.

Friday Night

A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 78. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

Saturday

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 91. South wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

Saturday Night

A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 77. South wind 5 to 10 mph. Chance of precipitation is 40%.

Sunday

Mostly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 25 mph.

Sunday Night

Partly cloudy, with a low around 77. South wind around 15 mph, with gusts as high as 25 mph.

Monday

Mostly sunny, with a high near 94. South wind 10 to 15 mph, with gusts as high as 20 mph.

Monday Night

Mostly clear, with a low around 76.

Tuesday

A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.

Tuesday Night

Partly cloudy, with a low around 75.