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

23°F

-5°C

Humidity 85%
Wind Speed Calm
Barometer 30.46 in (1031.9 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 11 Jan 9:53 pm CST
Extended Forecast for

3 Miles S Waterloo IL

  • Tonight

    Tonight: Clear, with a low around 25. Calm wind becoming south around 6 mph after midnight.

    Low: 25 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 53. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. Southwest wind 6 to 8 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. West wind 9 to 15 mph, with gusts as high as 26 mph.

    High: 62 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 43 by 10am, then falling to around 35 during the remainder of the day. Breezy.

    High: 43 °F⇓

    Partly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 25. Calm wind becoming south around 6 mph after midnight.
Monday
Sunny, with a high near 53. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 37. Southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 62. West wind 9 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 9 to 11 mph, with gusts as high as 20 mph.
Wednesday
Partly sunny, with a temperature rising to near 43 by 10am, then falling to around 35 during the remainder of the day. Breezy.
Wednesday Night
Mostly cloudy, with a low around 18.
Thursday
Mostly sunny, with a high near 35.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 44.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 32.
Saturday Night
Partly cloudy, with a low around 15.
Sunday
Sunny, with a high near 34.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Waterloo IL
 38.28°N 90.16°W (Elev. 607 ft)
Last Update:
10:36 pm CST Jan 11, 2026
Forecast Valid:
10pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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