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

66°F

19°C

Humidity 47%
Wind Speed S 8 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 4 Nov 5:53 pm CST
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Partly cloudy, with a low around 51. Southwest wind around 9 mph.

    Low: 51 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 69. Southwest wind 7 to 14 mph becoming north in the afternoon. Winds could gust as high as 28 mph.

    High: 69 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 38. North wind 5 to 7 mph becoming light and variable after midnight.

    Low: 38 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 64. Southeast wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 64 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 52. Southeast wind around 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.

    Low: 52 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly sunny, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 39.

    Low: 39 °F

    Slight Chance
    Rain then
    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 51. Southwest wind around 9 mph.
Wednesday
Sunny, with a high near 69. Southwest wind 7 to 14 mph becoming north in the afternoon. Winds could gust as high as 28 mph.
Wednesday Night
Clear, with a low around 38. North wind 5 to 7 mph becoming light and variable after midnight.
Thursday
Sunny, with a high near 64. Southeast wind 5 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A 30 percent chance of showers after midnight. Mostly cloudy, with a low around 52. Southeast wind around 10 mph becoming southwest after midnight. Winds could gust as high as 20 mph.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 71. Chance of precipitation is 30%.
Friday Night
Mostly clear, with a low around 43.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 39.
Sunday
Mostly sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 26.
Monday
Sunny, with a high near 43.
Monday Night
Mostly clear, with a low around 26.
Veterans Day
Mostly sunny, with a high near 53.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.35°N 90.16°W (Elev. 650 ft)
Last Update:
4:46 pm CST Nov 4, 2025
Forecast Valid:
6pm CST Nov 4, 2025-6pm CST Nov 11, 2025
 
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