Severe Weather and Heavy Rainfall from the High Plains to the Ohio Valley; Heat Continuing in the Central Plains and Southeast

A stationary front will be the focus for daily showers and thunderstorms capable of widely scattered flash flooding and severe weather from the High Plains to the Ohio Valley. Monsoonal thunderstorms could cause local flash flooding across the Southwest and the Great Basin. Dangerous heat continues across the Central Plains and Southeast. Many areas will see their hottest temperatures of the year. Read More >

Hazardous Weather Conditions

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

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Overcast

90°F

32°C

Humidity	56%
Wind Speed	SW 3 mph
Barometer	29.85 in (1009.3 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	98°F (37°C)
Last update	12 Aug 1:51 pm CDT

More Information:

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

Extended Forecast for

Saint Charles MO

Extreme Heat Warning August 12, 02:08pm until August 15, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning August 12, 02:08pm until August 15, 09:00pm
NOW until 9:00pm Sat
Extreme Heat Warning
This Afternoon
High: 94 °F
Isolated
T-storms
Tonight
Low: 78 °F
Scattered
T-storms
Thursday
High: 96 °F
Scattered
T-storms
Thursday Night
Low: 78 °F
Isolated
T-storms then
Partly Cloudy
Friday
High: 97 °F
Hot
Friday Night
Low: 78 °F
Mostly Clear
Saturday
High: 98 °F
Hot
Saturday Night
Low: 78 °F
Mostly Clear

Detailed Forecast

This Afternoon

Isolated showers and thunderstorms. Mostly cloudy, with a high near 94. Heat index values as high as 103. Southwest wind around 7 mph. Chance of precipitation is 20%.

Tonight

Scattered showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 78. Southwest wind around 6 mph becoming east after midnight. Chance of precipitation is 30%.

Thursday

Scattered showers and thunderstorms before 11am, then isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 96. Heat index values as high as 109. East wind around 6 mph becoming west in the morning. Chance of precipitation is 30%.

Thursday Night

Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 78. Southeast wind around 7 mph. Chance of precipitation is 20%.

Friday

Mostly sunny and hot, with a high near 97. Southwest wind 3 to 5 mph.

Friday Night

Mostly clear, with a low around 78.

Saturday

Sunny and hot, with a high near 98.

Saturday Night

Mostly clear, with a low around 78.

Sunday

Sunny, with a high near 96.