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.

Overcast

73°F

23°C

Humidity 94%
Wind Speed N 3 mph
Barometer 30.05 in (1017.1 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 14 Oct 11:53 am CDT
Extended Forecast for

Waterloo IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly before 5pm. Cloudy, with a high near 76. Northwest wind around 5 mph becoming calm.

    High: 76 °F

    Chance
    Showers

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 67. Light and variable wind. Chance of precipitation is 60%.

    Low: 67 °F

    Cloudy then
    Showers
    Likely

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 1pm. High near 84. Light and variable wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.

    High: 84 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Northwest wind 7 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 50%.

    Low: 50 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 57. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 30 mph.

    High: 57 °F

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly 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 69.

    High: 69 °F

    Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly before 5pm. Cloudy, with a high near 76. Northwest wind around 5 mph becoming calm.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 67. Light and variable wind. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms, mainly before 1pm. High near 84. Light and variable wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 50. Northwest wind 7 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 50%.
Friday
Mostly cloudy, with a high near 57. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 30 mph.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 60.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Mostly sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 48.
Tuesday
Mostly sunny, with a high near 77.
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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:
11:31 am CDT Oct 14, 2026
Forecast Valid:
12pm CDT Oct 14, 2026-6pm CDT Oct 20, 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