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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

A Few Clouds

93°F

34°C

Humidity	68%
Wind Speed	S 8 mph
Barometer	29.85 in (1010.2 mb)
Dewpoint	81°F (27°C)
Visibility	10.00 mi
Heat Index	114°F (46°C)
Last update	13 Aug 5:53 pm CDT

More Information:

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

Extended Forecast for

O'Fallon IL

Extreme Heat Warning August 13, 06:43pm until August 15, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 13, 06:43pm until August 15, 09:00pm
NOW until 9:00pm Sat
Extreme Heat Warning
Tonight
Low: 77 °F
Mostly Clear
Friday
High: 97 °F
Slight Chance
T-storms then
Sunny
Friday Night
Low: 77 °F
Mostly Clear
Saturday
High: 98 °F
Hot
Saturday Night
Low: 76 °F
Mostly Clear
Sunday
High: 97 °F
Hot
Sunday Night
Low: 73 °F
Chance
T-storms
Monday
High: 88 °F
Partly Sunny
then Slight
Chance
T-storms

Detailed Forecast

Tonight

Mostly clear, with a low around 77. South wind 5 to 7 mph.

Friday

A 20 percent chance of showers and thunderstorms before 8am. Mostly cloudy, then gradually becoming sunny and hot, with a high near 97. Heat index values as high as 111. South wind 3 to 7 mph.

Friday Night

Mostly clear, with a low around 77. Southeast wind 5 to 8 mph.

Saturday

Partly sunny through mid morning, then becoming sunny and hot, with a high near 98. Heat index values as high as 109. Southeast wind 5 to 7 mph becoming west in the afternoon.

Saturday Night

Mostly clear, with a low around 76. Southwest wind 3 to 5 mph.

Sunday

Mostly sunny and hot, with a high near 97.

Sunday Night

A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 73. Chance of precipitation is 40%.

Monday

A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88.

Monday Night

Partly cloudy, with a low around 69.

Tuesday

Sunny, with a high near 89.

Tuesday Night

Mostly clear, with a low around 72.

Wednesday

Mostly sunny, with a high near 94.

Wednesday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.