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.

Partly Cloudy

40°F

4°C

Humidity 73%
Wind Speed NW 20 G 30 mph
Barometer 29.81 in (1009.5 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 14 Jan 6:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Cloudy through mid morning, then gradual clearing, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 15 to 21 mph, with gusts as high as 37 mph.

    High: 40 °F⇓

    Gradual
    Clearing and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 18. Northwest wind 7 to 15 mph, with gusts as high as 28 mph.

    Low: 18 °F

    Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 36. Northwest wind around 6 mph becoming south in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.

    Low: 28 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Partly sunny, with a high near 46. West wind 10 to 15 mph, with gusts as high as 26 mph.

    High: 46 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 10.

    Low: 10 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny

Detailed Forecast

Today
Cloudy through mid morning, then gradual clearing, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 15 to 21 mph, with gusts as high as 37 mph.
Tonight
Clear, with a low around 18. Northwest wind 7 to 15 mph, with gusts as high as 28 mph.
Thursday
Increasing clouds, with a high near 36. Northwest wind around 6 mph becoming south in the afternoon.
Thursday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 28. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph.
Friday
Partly sunny, with a high near 46. West wind 10 to 15 mph, with gusts as high as 26 mph.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Partly sunny, with a high near 29.
Saturday Night
Partly cloudy, with a low around 10.
Sunday
Mostly sunny, with a high near 27.
Sunday Night
Partly cloudy, with a low around 16.
M.L.King Day
Mostly sunny, with a high near 32.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
4:21 am CST Jan 14, 2026
Forecast Valid:
7am CST Jan 14, 2026-6pm CST Jan 20, 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