Heavy Rainfall and Flooding Threats in the Midwest and Ohio Valley; Heat Continues in the Plains and Southeast

An active pattern will continue to bring heavy to excessive rainfall and flash flooding threats to the Midwest and Ohio Valley over the next couple of days. Dangerous heat continues across the central/southern Plains and Southeast U.S. into next week. There is potential for record-tying/breaking temperatures with many areas forecast to see their hottest temperatures so far this year. Read More >

Hazardous Weather Conditions

Extreme Heat Warning until August 15, 09:00 PM CDT

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

A Few Clouds

75°F

24°C

Humidity	90%
Wind Speed	Vrbl 3 mph
Barometer	29.85 in (1009.8 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Last update	13 Aug 5:54 am CDT

More Information:

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

Extended Forecast for

O'Fallon MO

Extreme Heat Warning August 13, 06:14am until August 15, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 13, 06:14am until August 15, 09:00pm
NOW until 9:00pm Sat
Extreme Heat Warning
Today
High: 95 °F
Chance
T-storms
Tonight
Low: 76 °F
Slight Chance
T-storms then
Partly Cloudy
Friday
High: 97 °F
Hot
Friday Night
Low: 77 °F
Mostly Clear
Saturday
High: 97 °F
Hot
Saturday Night
Low: 77 °F
Mostly Clear
Sunday
High: 96 °F
Sunny
Sunday Night
Low: 73 °F
Chance
T-storms

Detailed Forecast

Today

A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 95. Heat index values as high as 112. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.

Tonight

A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Southeast wind around 6 mph.

Friday

Partly sunny, then gradually becoming sunny and hot, with a high near 97. Heat index values as high as 111. Light and variable wind.

Friday Night

Mostly clear, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.

Saturday

Sunny and hot, with a high near 97. West wind 3 to 5 mph.

Saturday Night

Mostly clear, with a low around 77.

Sunday

Sunny, with a high near 96.