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.

Fair

16°F

-9°C

Humidity 67%
Wind Speed Calm
Barometer 30.26 in (1025.3 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Last update 4 Dec 8:53 pm CST
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Clear, with a low around 13. Calm wind.

    Low: 13 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 41. South wind 3 to 7 mph.

    High: 41 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 27. South wind 5 to 7 mph becoming west after midnight.

    Low: 27 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a high near 40. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 40 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28. East wind 3 to 6 mph.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly cloudy, with a high near 39.

    High: 39 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 13. Calm wind.
Friday
Sunny, with a high near 41. South wind 3 to 7 mph.
Friday Night
Increasing clouds, with a low around 27. South wind 5 to 7 mph becoming west after midnight.
Saturday
Cloudy, then gradually becoming mostly sunny, with a high near 40. Calm wind becoming northeast around 5 mph in the afternoon.
Saturday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28. East wind 3 to 6 mph.
Sunday
A 20 percent chance of rain before noon. Mostly cloudy, with a high near 39.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 48.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Partly sunny, with a high near 36.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
8:26 pm CST Dec 4, 2025
Forecast Valid:
10pm CST Dec 4, 2025-6pm CST Dec 11, 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