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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

77°F

25°C

Humidity 94%
Wind Speed Calm
Barometer 30.00 in (1015.2 mb)
Dewpoint 75°F (24°C)
Visibility 8.00 mi
Heat Index78°F (26°C)
Last update 18 Aug 2:53 am CDT
Extended Forecast for

2 Miles SSE Cahokia IL

Heat Advisory August 18, 03:47am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 03:47am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Overnight

    Low: 81 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 98. Heat index values as high as 111. Calm wind becoming south 5 to 7 mph in the morning.

    High: 98 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 74. South wind 3 to 5 mph.

    Low: 74 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 40 percent chance of showers and thunderstorms, mainly after 7am. Mostly sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming northwest around 6 mph in the afternoon.

    High: 95 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. North wind around 5 mph becoming calm in the evening.

    Low: 75 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

Detailed Forecast

Overnight
Partly cloudy, with a steady temperature around 81. Calm wind.
Monday
A 20 percent chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 98. Heat index values as high as 111. Calm wind becoming south 5 to 7 mph in the morning.
Monday Night
Partly cloudy, with a low around 74. South wind 3 to 5 mph.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly after 7am. Mostly sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming northwest around 6 mph in the afternoon.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75. North wind around 5 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 88.
Friday Night
Mostly clear, with a low around 67.
Saturday
Sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Cahokia IL
 38.55°N 90.18°W (Elev. 407 ft)
Last Update:
2:16 am CDT Aug 18, 2025
Forecast Valid:
3am CDT Aug 18, 2025-6pm CDT Aug 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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