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 85%
Wind Speed Calm
Barometer 30.44 in (1031.3 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 11 Jan 11:53 pm CST
Extended Forecast for

4 Miles WSW Waterloo IL

  • Overnight

    Overnight: Clear, with a low around 23. Calm wind becoming south around 6 mph.

    Low: 23 °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. South wind 5 to 8 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. Southwest wind 8 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. Blustery.

    Low: 18 °F

    Mostly Cloudy
    and Blustery
    then Partly
    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

Overnight
Clear, with a low around 23. Calm wind becoming south around 6 mph.
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. South wind 5 to 8 mph.
Tuesday
Mostly sunny, with a high near 62. Southwest wind 8 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. Blustery.
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:
4 Miles WSW Waterloo IL
 38.31°N 90.22°W (Elev. 623 ft)
Last Update:
12:31 am CST Jan 12, 2026
Forecast Valid:
12am CST Jan 12, 2026-6pm CST Jan 18, 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