Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Fair

80°F

27°C

Humidity	76%
Wind Speed	N 5 mph
Barometer	30.16 in (1019.6 mb)
Dewpoint	72°F (22°C)
Visibility	10.00 mi
Heat Index	84°F (29°C)
Last update	18 Sep 1:51 am CDT

More Information:

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

Extended Forecast for

2 Miles SE Saint Charles MO

Heat Advisory September 18, 02:51am until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 18, 02:51am until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
Overnight
Low: 75 °F
Mostly Clear
Friday
High: 96 °F
Mostly Sunny
then Slight
Chance
T-storms
Friday Night
Low: 74 °F
Slight Chance
T-storms then
Partly Cloudy
Saturday
High: 96 °F
Increasing
Clouds
Saturday Night
Low: 74 °F
Partly Cloudy
Sunday
High: 92 °F
Chance
Showers
Sunday Night
Low: 68 °F
Chance
T-storms then
Showers
Likely
Monday
High: 80 °F
Showers
Likely

Detailed Forecast

Overnight

Mostly clear, with a low around 75. Calm wind.

Friday

A slight chance of showers between 2pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. Heat index values as high as 107. Light and variable wind. Chance of precipitation is 20%.

Friday Night

A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 74. Southeast wind 5 to 7 mph.

Saturday

Increasing clouds, with a high near 96. Heat index values as high as 101. South wind 5 to 8 mph becoming west in the morning.

Saturday Night

Partly cloudy, with a low around 74. Calm wind becoming south around 5 mph after midnight.

Sunday

A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 92. 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 68. Chance of precipitation is 60%.

Monday

Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.

Monday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 30%.

Tuesday

Partly sunny, with a high near 73.

Tuesday Night

Mostly cloudy, with a low around 56.

Wednesday

Mostly sunny, with a high near 75.

Wednesday Night

Partly cloudy, with a low around 56.