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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

44°F

7°C

Humidity 96%
Wind Speed N 13 mph
Barometer 29.93 in (1013.6 mb)
Dewpoint 43°F (6°C)
Visibility 8.00 mi
Wind Chill38°F (3°C)
Last update 15 Feb 7:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 56. North wind 5 to 9 mph becoming light northwest in the afternoon.

    High: 56 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly clear, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Clear
    then Patchy
    Fog

  • Washington's Birthday

    Washington's Birthday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64. Light southwest wind becoming south 5 to 10 mph in the morning.

    High: 64 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43. South wind 5 to 7 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers after noon. Sunny, with a high near 73.

    High: 73 °F

    Sunny then
    Chance
    Showers

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 56. North wind 5 to 9 mph becoming light northwest in the afternoon.
Tonight
Patchy fog after 4am. Otherwise, mostly clear, with a low around 35. Calm wind.
Washington's Birthday
Patchy fog before 10am. Otherwise, mostly sunny, with a high near 64. Light southwest wind becoming south 5 to 10 mph in the morning.
Monday Night
Mostly cloudy, with a low around 43. South wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 65. South wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
A 30 percent chance of showers after noon. Sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 40.
Friday
Mostly sunny, with a high near 54.
Friday Night
Partly cloudy, with a low around 31.
Saturday
Mostly sunny, with a high near 51.
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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:
7:56 am CST Feb 15, 2026
Forecast Valid:
8am CST Feb 15, 2026-6pm CST Feb 21, 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