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.

Fog/Mist

66°F

19°C

Humidity 96%
Wind Speed Calm
Barometer 30.05 in (1017.4 mb)
Dewpoint 65°F (18°C)
Visibility 0.75 mi
Last update 14 Oct 10:53 pm CDT
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Scattered showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 30%.

    Low: 67 °F

    Scattered
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 81. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then a chance of showers between 1am and 3am. Increasing clouds, with a low around 48. Southwest wind 8 to 16 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Friday

    Friday: Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 28 mph.

    High: 56 °F

    Partly Sunny
    then Partly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 40. North wind 9 to 14 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Scattered showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 81. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 60%.
Thursday Night
Showers and thunderstorms likely before 1am, then a chance of showers between 1am and 3am. Increasing clouds, with a low around 48. Southwest wind 8 to 16 mph becoming northwest after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 56. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 40. North wind 9 to 14 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 60.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 50.
Wednesday
Sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
10:21 pm CDT Oct 14, 2026
Forecast Valid:
11pm CDT Oct 14, 2026-6pm CDT Oct 21, 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