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

51°F

11°C

Humidity 83%
Wind Speed S 9 mph
Barometer 29.90 in (1012.6 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 17 Feb 9:53 am CST
Extended Forecast for

Waterloo IL

  • Today

    Today: Mostly cloudy, with a high near 60. South wind 10 to 15 mph, with gusts as high as 29 mph.

    High: 60 °F

    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of rain between 2am and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 54. South wind 15 to 18 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 72. Southwest wind 7 to 14 mph, with gusts as high as 24 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly clear, with a low around 50. South wind around 6 mph.

    Low: 50 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South wind 7 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 40%.

    High: 71 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 37.

    Low: 37 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: A slight chance of rain and snow after midnight. Partly cloudy, with a low around 31. Chance of precipitation is 20%.

    Low: 31 °F

    Partly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Saturday

    Saturday: A 30 percent chance of snow. Mostly sunny, with a high near 45.

    High: 45 °F

    Chance Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 60. South wind 10 to 15 mph, with gusts as high as 29 mph.
Tonight
A slight chance of rain between 2am and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 54. South wind 15 to 18 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 72. Southwest wind 7 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
A 20 percent chance of showers. Mostly clear, with a low around 50. South wind around 6 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 71. South wind 7 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 37.
Friday
Sunny, with a high near 51.
Friday Night
A slight chance of rain and snow after midnight. Partly cloudy, with a low around 31. Chance of precipitation is 20%.
Saturday
A 30 percent chance of snow. Mostly sunny, with a high near 45.
Saturday Night
A 20 percent chance of snow before midnight. Mostly clear, with a low around 26.
Sunday
Sunny, with a high near 40.
Sunday Night
Mostly clear, with a low around 19.
Monday
Sunny, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
5:01 am CST Feb 17, 2026
Forecast Valid:
9am CST Feb 17, 2026-6pm CST Feb 23, 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