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

46°F

8°C

Humidity 56%
Wind Speed E 5 mph
Barometer 29.79 in (1008.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 25 Feb 9:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 35. Northeast wind 5 to 9 mph.

    Low: 35 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: Partly sunny, with a high near 56. East wind 5 to 7 mph becoming calm in the afternoon.

    High: 56 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 37. Light and variable wind becoming southwest around 6 mph in the evening.

    Low: 37 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 69. Southwest wind 6 to 10 mph.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 42. South wind 6 to 8 mph becoming north after midnight.

    Low: 42 °F

    Clear

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Sunny, with a high near 66.

    High: 66 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 33.

    Low: 33 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 46. Chance of precipitation is 40%.

    High: 46 °F

    Slight Chance
    Rain then
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow likely before midnight, then rain, snow, and freezing rain likely. Cloudy, with a low around 30. Chance of precipitation is 70%.

    Low: 30 °F

    Wintry Mix
    Likely

Detailed Forecast

Tonight
A 50 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 35. Northeast wind 5 to 9 mph.
Thursday
Partly sunny, with a high near 56. East wind 5 to 7 mph becoming calm in the afternoon.
Thursday Night
Clear, with a low around 37. Light and variable wind becoming southwest around 6 mph in the evening.
Friday
Sunny, with a high near 69. Southwest wind 6 to 10 mph.
Friday Night
Clear, with a low around 42. South wind 6 to 8 mph becoming north after midnight.
Saturday
A 20 percent chance of rain before noon. Sunny, with a high near 66.
Saturday Night
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 33.
Sunday
A slight chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 46. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely before midnight, then rain, snow, and freezing rain likely. Cloudy, with a low around 30. Chance of precipitation is 70%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 41. Chance of precipitation is 30%.
Monday Night
A chance of rain or freezing rain. Cloudy, with a low around 29. Chance of precipitation is 40%.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 46.
Tuesday Night
A 40 percent chance of rain. Cloudy, with a low around 34.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Waterloo IL
 38.29°N 90.19°W (Elev. 633 ft)
Last Update:
9:51 pm CST Feb 25, 2026
Forecast Valid:
10pm CST Feb 25, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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Additional Resources

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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