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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Cahokia / St. Louis, St. Louis Downtown Airport IL

Extreme Heat Warning July 29, 09:31pm until July 30, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 29, 09:31pm until July 30, 07:00pm

    NOW until 7:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog before 8am. Otherwise, sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming south around 5 mph in the afternoon.

    High: 95 °F

    Patchy Fog
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. East wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. North wind 5 to 10 mph.

    High: 82 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 64. North wind 7 to 10 mph.

    Low: 64 °F

    Slight Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 76. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Patchy fog before 8am. Otherwise, sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. East wind around 5 mph becoming calm in the evening.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. North wind 5 to 10 mph.
Thursday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 64. North wind 7 to 10 mph.
Friday
Mostly sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 60.
Saturday
Sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 64.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia / St. Louis, St. Louis Downtown Airport IL
 38.57°N 90.15°W (Elev. 407 ft)
Last Update:
5:46 pm CDT Jul 29, 2025
Forecast Valid:
9pm CDT Jul 29, 2025-6pm CDT Aug 5, 2025
 
Forecast Discussion
 
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Additional Resources

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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