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

71°F

22°C

Humidity 66%
Wind Speed SE 7 mph
Barometer 30.01 in (1016.0 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 16 Oct 8:53 pm CDT
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Southeast wind around 7 mph.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 83. South wind 6 to 10 mph.

    High: 83 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. South wind around 8 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 81. Southwest wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.

    High: 81 °F

    Showers
    Likely then
    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 50. Southwest wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.

    Low: 50 °F

    Showers
    Likely

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers. Partly cloudy, with a low around 51.

    Low: 51 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. Southeast wind around 7 mph.
Friday
Partly sunny, with a high near 83. South wind 6 to 10 mph.
Friday Night
Mostly clear, with a low around 62. South wind around 8 mph.
Saturday
Showers and possibly a thunderstorm. High near 81. Southwest wind 8 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Mostly cloudy, with a low around 50. Southwest wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.
Sunday
Sunny, with a high near 65.
Sunday Night
Clear, with a low around 44.
Monday
Sunny, with a high near 73.
Monday Night
A 30 percent chance of showers. Partly cloudy, with a low around 51.
Tuesday
A 20 percent chance of showers before 1pm. Sunny, with a high near 66.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Sunny, with a high near 66.
Wednesday Night
Partly cloudy, with a low around 46.
Thursday
Mostly sunny, with a high near 67.
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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:
7:26 pm CDT Oct 16, 2025
Forecast Valid:
9pm CDT Oct 16, 2025-6pm CDT Oct 23, 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