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

74°F

23°C

Humidity	97%
Wind Speed	Calm
Barometer	30.22 in (1022.7 mb)
Dewpoint	73°F (23°C)
Visibility	8.00 mi
Last update	16 Sep 11:53 pm CDT

More Information:

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

Extended Forecast for

Lemay MO

Heat Advisory September 17, 12:22am until September 19, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory September 17, 12:22am until September 19, 08:00pm
NOW until 8:00pm Sat
Heat Advisory
Overnight
Low: 76 °F
Mostly Clear
Thursday
High: 99 °F
Sunny then
Slight Chance
T-storms
Thursday Night
Low: 74 °F
Mostly Clear
Friday
High: 97 °F
Sunny then
Slight Chance
T-storms
Friday Night
Low: 75 °F
Mostly Clear
Saturday
High: 98 °F
Hot
Saturday Night
Low: 73 °F
Partly Cloudy
then Chance
Showers
Sunday
High: 94 °F
Slight Chance
Showers then
Slight Chance
T-storms

Detailed Forecast

Overnight

Mostly clear, with a low around 76. Light south wind.

Thursday

A slight chance of showers and thunderstorms between 2pm and 3pm. Sunny and hot, with a high near 99. Heat index values as high as 109. Light and variable wind becoming west 5 to 7 mph in the morning. Chance of precipitation is 20%.

Thursday Night

Mostly clear, with a low around 74. 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 105. Light and variable wind. Chance of precipitation is 20%.

Friday Night

Mostly clear, with a low around 75. Calm wind becoming south around 5 mph after midnight.

Saturday

Mostly sunny and hot, with a high near 98.

Saturday Night

A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73.

Sunday

A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 94. Chance of precipitation is 20%.

Sunday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 20%.

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%.