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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fog/Mist

47°F

8°C

Humidity 100%
Wind Speed SE 6 mph
Barometer 29.94 in (1013.9 mb)
Dewpoint 47°F (8°C)
Visibility 2.50 mi
Wind Chill44°F (7°C)
Last update 27 Dec 3:53 am CST
Extended Forecast for

Cahokia IL

Dense Fog Advisory December 27, 04:30am until December 27, 09:00am
Click here for hazard details and duration
...
  •  
    Dense Fog Advisory December 27, 04:30am until December 27, 09:00am

    NOW until 9:00am Sat

    Dense Fog Advisory

  • Today

    High: 64 °F

    Areas Dense
    Fog then
    Mostly Cloudy

  • Tonight

    Tonight: A 20 percent chance of showers after 10pm. Cloudy, with a low around 59. South wind 6 to 8 mph.

    Low: 59 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. Temperature rising to near 71 by 11am, then falling to around 58 during the remainder of the day. South wind 7 to 16 mph becoming west in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    High: 71 °F⇓

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 20. Breezy, with a west wind 17 to 20 mph, with gusts as high as 33 mph.

    Low: 20 °F

    Chance
    Showers then
    Partly Cloudy
    and Breezy

  • Monday

    Monday: Mostly sunny, with a high near 29. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 33 mph.

    High: 29 °F

    Mostly Sunny
    and Blustery
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Today
Areas of dense fog before 10am. Otherwise, mostly cloudy, with a high near 64. Calm wind becoming southeast 5 to 9 mph in the morning.
Tonight
A 20 percent chance of showers after 10pm. Cloudy, with a low around 59. South wind 6 to 8 mph.
Sunday
Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. Temperature rising to near 71 by 11am, then falling to around 58 during the remainder of the day. South wind 7 to 16 mph becoming west in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 20. Breezy, with a west wind 17 to 20 mph, with gusts as high as 33 mph.
Monday
Mostly sunny, with a high near 29. Blustery, with a northwest wind 15 to 20 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Mostly clear, with a low around 27.
Wednesday
Mostly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 24.
New Year's Day
Mostly sunny, with a high near 36.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Mostly sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
3:36 am CST Dec 27, 2025
Forecast Valid:
4am CST Dec 27, 2025-6pm CST Jan 2, 2026
 
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