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

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Hazardous Weather Conditions

Heat Advisory until September 19, 08:00 PM CDT

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

76°F

24°C

Humidity	94%
Wind Speed	Calm
Barometer	30.22 in (1023.0 mb)
Dewpoint	74°F (23°C)
Visibility	10.00 mi
Heat Index	76°F (24°C)
Last update	16 Sep 10:53 pm CDT

More Information:

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

Extended Forecast for

Herculaneum MO

Heat Advisory September 16, 11:30pm until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 16, 11:30pm until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
Tonight
Low: 72 °F
Mostly Clear
Thursday
High: 98 °F
Hot
Thursday Night
Low: 71 °F
Mostly Clear
Friday
High: 97 °F
Sunny then
Slight Chance
T-storms
Friday Night
Low: 70 °F
Mostly Clear
Saturday
High: 97 °F
Hot
Saturday Night
Low: 70 °F
Partly Cloudy
then Slight
Chance
T-storms
Sunday
High: 94 °F
Mostly Sunny
then Slight
Chance
Showers

Detailed Forecast

Tonight

Mostly clear, with a low around 72. Calm wind.

Thursday

Sunny and hot, with a high near 98. Heat index values as high as 109. Calm wind becoming west 5 to 7 mph in the morning.

Thursday Night

Mostly clear, with a low around 71. Light and variable wind.

Friday

A slight chance of showers and thunderstorms between 1pm and 2pm. Sunny and hot, with a high near 97. Heat index values as high as 106. Light southwest wind. Chance of precipitation is 20%.

Friday Night

Mostly clear, with a low around 70. Calm wind.

Saturday

Sunny and hot, with a high near 97.

Saturday Night

A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 70.

Sunday

A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 94.

Sunday Night

A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 67.

Monday

A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 30%.