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

26°F

-3°C

Humidity 78%
Wind Speed W 6 mph
Barometer 30.11 in (1020.0 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 2 Dec 1:53 pm CST
Extended Forecast for

4 Miles WSW Mascoutah IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 28. Light and variable wind.

    High: 28 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 20. Calm wind becoming south around 5 mph after midnight.

    Low: 20 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 41. South wind around 6 mph becoming northwest in the afternoon.

    High: 41 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 16. North wind 5 to 10 mph.

    Low: 16 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 25. North wind 5 to 9 mph becoming light in the afternoon.

    High: 25 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 28. Light and variable wind.
Tonight
Partly cloudy, with a low around 20. Calm wind becoming south around 5 mph after midnight.
Wednesday
Increasing clouds, with a high near 41. South wind around 6 mph becoming northwest in the afternoon.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 16. North wind 5 to 10 mph.
Thursday
Mostly sunny, with a high near 25. North wind 5 to 9 mph becoming light in the afternoon.
Thursday Night
Partly cloudy, with a low around 14.
Friday
Mostly sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
A 20 percent chance of rain. Mostly cloudy, with a high near 36.
Sunday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 20. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 35.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Mascoutah IL
 38.5°N 89.87°W (Elev. 449 ft)
Last Update:
2:11 pm CST Dec 2, 2025
Forecast Valid:
2pm CST Dec 2, 2025-6pm CST Dec 8, 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