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.

Overcast

35°F

2°C

Humidity 82%
Wind Speed NW 7 mph
Barometer 30.20 in (1022.8 mb)
Dewpoint 30°F (-1°C)
Visibility 9.00 mi
Wind Chill29°F (-2°C)
Last update 12 Dec 8:53 pm CST
Extended Forecast for

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

Cold Weather Advisory December 13, 09:00pm until December 14, 12:00pm
Click here for hazard details and duration
Cold Weather Advisory

  • Tonight

    Tonight: Cloudy, with a low around 23. Northwest wind 5 to 7 mph.

    Low: 23 °F

    Cloudy

  • Saturday

    Saturday: A slight chance of snow before 3pm, then a slight chance of snow after 5pm. Cloudy, with a high near 30. North wind 6 to 10 mph. Chance of precipitation is 20%.

    High: 30 °F

    Cloudy then
    Slight Chance
    Snow

  • Saturday Night

    Saturday Night: A 20 percent chance of snow before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 4. Wind chill values as low as -10. North wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 4 °F

    Slight Chance
    Snow then
    Mostly Clear

  • Sunday

    Sunday: Sunny and cold, with a high near 16. Wind chill values as low as -10. North wind 6 to 11 mph becoming light in the afternoon. Winds could gust as high as 20 mph.

    High: 16 °F

    Cold

  • Sunday Night

    Sunday Night: Clear, with a low around 6. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 6 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 40.

    High: 40 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 23. Northwest wind 5 to 7 mph.
Saturday
A slight chance of snow before 3pm, then a slight chance of snow after 5pm. Cloudy, with a high near 30. North wind 6 to 10 mph. Chance of precipitation is 20%.
Saturday Night
A 20 percent chance of snow before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 4. Wind chill values as low as -10. North wind 11 to 13 mph, with gusts as high as 21 mph.
Sunday
Sunny and cold, with a high near 16. Wind chill values as low as -10. North wind 6 to 11 mph becoming light in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Clear, with a low around 6. Calm wind becoming south 5 to 7 mph after midnight.
Monday
Sunny, with a high near 40.
Monday Night
Mostly clear, with a low around 25.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly sunny, with a high near 58.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 43.
Thursday
A 20 percent chance of rain. Partly sunny, with a high near 56.
Thursday Night
Partly cloudy, with a low around 32.
Friday
Partly sunny, with a high near 50.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia / St. Louis, St. Louis Downtown Airport IL
 38.57°N 90.15°W (Elev. 407 ft)
Last Update:
8:37 pm CST Dec 12, 2025
Forecast Valid:
9pm CST Dec 12, 2025-6pm CST Dec 19, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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