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

58°F

14°C

Humidity 38%
Wind Speed NW 12 mph
Barometer 30.27 in (1025.1 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 5 Apr 5:53 pm CDT
Extended Forecast for

4 Miles S Waterloo IL

  • Tonight

    Tonight: Clear, with a low around 41. Northwest wind 5 to 10 mph becoming light and variable.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 63. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 38. North wind 6 to 9 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 55. Northeast wind around 10 mph.

    High: 55 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 38. East wind around 8 mph.

    Low: 38 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 72. Chance of precipitation is 20%.

    High: 72 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 20%.

    Low: 56 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Clear, with a low around 41. Northwest wind 5 to 10 mph becoming light and variable.
Monday
Sunny, with a high near 63. Northwest wind 6 to 10 mph, with gusts as high as 21 mph.
Monday Night
Increasing clouds, with a low around 38. North wind 6 to 9 mph, with gusts as high as 21 mph.
Tuesday
Partly sunny, with a high near 55. Northeast wind around 10 mph.
Tuesday Night
Partly cloudy, with a low around 38. East wind around 8 mph.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 72. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 20%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 40%.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Saturday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 60.
Sunday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Waterloo IL
 38.26°N 90.16°W (Elev. 659 ft)
Last Update:
5:36 pm CDT Apr 5, 2026
Forecast Valid:
5pm CDT Apr 5, 2026-6pm CDT Apr 12, 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