Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

96°F

36°C

Humidity	46%
Wind Speed	Vrbl 3 mph
Barometer	30.05 in (1016.4 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	105°F (41°C)
Last update	18 Sep 2:54 pm CDT

More Information:

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

Extended Forecast for

Wentzville MO

Heat Advisory September 18, 03:06pm until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 18, 03:06pm until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
This Afternoon
High: 96 °F
Chance
T-storms
Tonight
Low: 73 °F
Slight Chance
T-storms then
Mostly Clear
Saturday
High: 97 °F
Hot
Saturday Night
Low: 72 °F
Partly Cloudy
Sunday
High: 91 °F
Slight Chance
Showers then
Chance
T-storms
Sunday Night
Low: 65 °F
Chance
T-storms then
Showers
Likely
Monday
High: 77 °F
Showers
Likely
Monday Night
Low: 59 °F
Chance
Showers

Detailed Forecast

This Afternoon

A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny, with a high near 96. Heat index values as high as 106. Calm wind.

Tonight

A 20 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 73. Light southeast wind.

Saturday

Partly sunny and hot, with a high near 97. Heat index values as high as 100. Southwest wind 3 to 8 mph.

Saturday Night

Partly cloudy, with a low around 72. Light and variable wind.

Sunday

A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 91. West wind 3 to 5 mph. Chance of precipitation is 30%.

Sunday Night

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.

Monday

Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.

Monday Night

A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 59.

Tuesday

Mostly cloudy, with a high near 70.

Tuesday Night

Mostly cloudy, with a low around 53.

Wednesday

Mostly sunny, with a high near 73.

Wednesday Night

Partly cloudy, with a low around 54.