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 52%
Wind Speed NW 14 G 23 mph
Barometer 30.16 in (1021.8 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 17 Mar 12:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Overnight

    Overnight: Mostly clear, with a low around 15. West wind 7 to 13 mph, with gusts as high as 21 mph.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 36. Northwest wind 5 to 10 mph becoming southwest in the afternoon.

    High: 36 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 3am, then a chance of rain. Cloudy, with a low around 31. Southeast wind 6 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 31 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 64. South wind 8 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.

    High: 64 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 44. South wind 3 to 5 mph.

    Low: 44 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 15. West wind 7 to 13 mph, with gusts as high as 21 mph.
Tuesday
Increasing clouds, with a high near 36. Northwest wind 5 to 10 mph becoming southwest in the afternoon.
Tuesday Night
A chance of snow before 3am, then a chance of rain. Cloudy, with a low around 31. Southeast wind 6 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 64. South wind 8 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Partly cloudy, with a low around 44. South wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 48.
Friday
Sunny, with a high near 76.
Friday Night
Mostly clear, with a low around 50.
Saturday
Sunny, with a high near 78.
Saturday Night
Clear, with a low around 53.
Sunday
Sunny, with a high near 75.
Sunday Night
Partly cloudy, with a low around 42.
Monday
Partly sunny, with a high near 57.
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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:
1:41 am CDT Mar 17, 2026
Forecast Valid:
1am CDT Mar 17, 2026-6pm CDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation