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.

Mostly Cloudy

30°F

-1°C

Humidity 41%
Wind Speed S 5 mph
Barometer 29.86 in (1011.5 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 15 Jan 8:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: A 30 percent chance of snow, mainly between 11pm and midnight. Cloudy, then gradually becoming partly cloudy, with a temperature rising to around 33 by 2am. South wind 8 to 10 mph, with gusts as high as 22 mph.

    Low: 28 °F⇑

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: A chance of sprinkles after 4pm. Increasing clouds, with a high near 45. West wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 45 °F

    Chance
    Sprinkles

  • Friday Night

    Friday Night: A slight chance of rain before 8pm, then a chance of snow. Mostly cloudy, with a low around 21. Northwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 21 °F

    Chance
    Rain/Snow
    then Chance
    Snow

  • Saturday

    Saturday: Partly sunny, with a high near 27. West wind 11 to 14 mph, with gusts as high as 23 mph.

    High: 27 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 11. Northwest wind 7 to 10 mph.

    Low: 11 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 24.

    High: 24 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of snow, mainly between 11pm and midnight. Cloudy, then gradually becoming partly cloudy, with a temperature rising to around 33 by 2am. South wind 8 to 10 mph, with gusts as high as 22 mph.
Friday
A chance of sprinkles after 4pm. Increasing clouds, with a high near 45. West wind 9 to 16 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of rain before 8pm, then a chance of snow. Mostly cloudy, with a low around 21. Northwest wind 11 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 27. West wind 11 to 14 mph, with gusts as high as 23 mph.
Saturday Night
Mostly clear, with a low around 11. Northwest wind 7 to 10 mph.
Sunday
Mostly sunny, with a high near 30.
Sunday Night
Partly cloudy, with a low around 16.
M.L.King Day
Sunny, with a high near 24.
Monday Night
Mostly clear, with a low around 9.
Tuesday
Sunny, with a high near 36.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Mostly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 21.
Thursday
Mostly sunny, with a high near 41.
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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:
8:37 pm CST Jan 15, 2026
Forecast Valid:
9pm CST Jan 15, 2026-6pm CST Jan 22, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation