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.

Fair

75°F

24°C

Humidity	82%
Wind Speed	Calm
Barometer	29.84 in (1009.4 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Last update	12 Aug 9:54 pm CDT

More Information:

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

Extended Forecast for

Chesterfield MO

Extreme Heat Warning August 12, 10:51pm until August 15, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 12, 10:51pm until August 15, 09:00pm
NOW until 9:00pm Sat
Extreme Heat Warning
Tonight
Low: 75 °F
Mostly Cloudy
then
Scattered
T-storms
Thursday
High: 98 °F
Scattered
T-storms
Thursday Night
Low: 78 °F
Isolated
T-storms then
Mostly Clear
Friday
High: 99 °F
Hot
Friday Night
Low: 78 °F
Mostly Clear
Saturday
High: 99 °F
Hot
Saturday Night
Low: 77 °F
Mostly Clear
Sunday
High: 98 °F
Hot

Detailed Forecast

Tonight

Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 75. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 30%.

Thursday

Scattered showers and thunderstorms before 10am, then isolated showers and thunderstorms after 3pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 110. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 30%.

Thursday Night

Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 78. Southeast wind around 6 mph becoming south after midnight. Chance of precipitation is 20%.

Friday

Mostly sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind around 6 mph.

Friday Night

Mostly clear, with a low around 78. South wind 3 to 5 mph.

Saturday

Sunny and hot, with a high near 99.

Saturday Night

Mostly clear, with a low around 77.

Sunday

Sunny and hot, with a high near 98.

Sunday Night

A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.