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

22°F

-6°C

Humidity 63%
Wind Speed S 3 mph
Barometer 30.30 in (1026.7 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Last update 24 Feb 12:53 am CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Overnight

    Overnight: Partly cloudy, with a low around 20. South wind 5 to 10 mph.

    Low: 20 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 54. Breezy, with a southwest wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 34 mph.

    High: 54 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 54. Light and variable wind becoming east around 6 mph in the afternoon.

    High: 54 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 38. Northeast wind 6 to 8 mph. Chance of precipitation is 60%.

    Low: 38 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Partly sunny, with a high near 52.

    High: 52 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 20. South wind 5 to 10 mph.
Tuesday
Partly sunny, with a high near 54. Breezy, with a southwest wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 34 mph.
Tuesday Night
Mostly cloudy, with a low around 37. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 54. Light and variable wind becoming east around 6 mph in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 38. Northeast wind 6 to 8 mph. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain before noon. Partly sunny, with a high near 52.
Thursday Night
Mostly clear, with a low around 33.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 42.
Saturday
Sunny, with a high near 68.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 46.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 40%.
Monday
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 49.
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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:
12:26 am CST Feb 24, 2026
Forecast Valid:
1am CST Feb 24, 2026-6pm CST Mar 2, 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