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 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

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

72°F

22°C

Humidity 94%
Wind Speed W 3 mph
Barometer 30.20 in (1022.0 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 17 Sep 6:54 am CDT
Extended Forecast for

2 Miles W Cottleville MO

Heat Advisory September 17, 07:38am until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 17, 07:38am until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Today

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly clear, with a low around 73. Light and variable wind.

    Low: 73 °F

    Mostly Clear
    then Patchy
    Fog

  • Friday

    Friday: Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 94. Heat index values as high as 105. Calm wind becoming south around 5 mph.

    High: 94 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74. Calm wind becoming south around 5 mph after midnight.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 95. Southwest wind 5 to 8 mph.

    High: 95 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.

    High: 90 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 96. Heat index values as high as 106. West wind 3 to 7 mph.
Tonight
Patchy fog after 4am. Otherwise, mostly clear, with a low around 73. Light and variable wind.
Friday
Patchy fog between 7am and 8am. Otherwise, sunny, with a high near 94. Heat index values as high as 105. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 74. Calm wind becoming south around 5 mph after midnight.
Saturday
Mostly sunny, with a high near 95. Southwest wind 5 to 8 mph.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 72.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
Sunday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Chance of precipitation is 50%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 62.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Cottleville MO
 38.74°N 90.68°W (Elev. 466 ft)
Last Update:
5:46 am CDT Sep 17, 2026
Forecast Valid:
7am CDT Sep 17, 2026-6pm CDT Sep 23, 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