National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

78°F

26°C

Humidity 85%
Wind Speed Calm
Barometer 30.15 in (1020.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 17 Sep 10:53 pm CDT
Extended Forecast for

Pevely MO

Heat Advisory September 17, 11:17pm until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 17, 11:17pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 72 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 97. Heat index values as high as 107. Light and variable wind.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 71. Southeast wind 3 to 5 mph.

    Low: 71 °F

    Gradual
    Clearing

  • Saturday

    Saturday: Increasing clouds and hot, with a high near 97. Heat index values as high as 102. Light and variable wind becoming west 5 to 7 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers. Mostly sunny, with a high near 95.

    High: 95 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 72. Calm wind.
Friday
Sunny and hot, with a high near 97. Heat index values as high as 107. Light and variable wind.
Friday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 71. Southeast wind 3 to 5 mph.
Saturday
Increasing clouds and hot, with a high near 97. Heat index values as high as 102. Light and variable wind becoming west 5 to 7 mph.
Saturday Night
Partly cloudy, with a low around 70. Calm wind.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 95.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67.
Monday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 86. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 61.
Tuesday
Partly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 57.
Thursday
Mostly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Pevely MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
9:46 pm CDT Sep 17, 2026
Forecast Valid:
11pm CDT Sep 17, 2026-6pm CDT Sep 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation