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

59°F

15°C

Humidity 27%
Wind Speed SW 5 mph
Barometer 30.16 in (1021.6 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 12 Jan 3:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then clearing, with a low around 39. Southwest wind 6 to 9 mph.

    Low: 39 °F

    Clearing

  • Tuesday

    Tuesday: Increasing clouds, with a high near 63. West wind 9 to 13 mph, with gusts as high as 26 mph.

    High: 63 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly between 7pm and 11pm. Mostly cloudy, with a low around 38. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 38 °F

    Chance Rain

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 41 by 10am, then falling to around 34 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 32 mph.

    High: 41 °F⇓

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 17. North wind 9 to 17 mph, with gusts as high as 28 mph.

    Low: 17 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then clearing, with a low around 39. Southwest wind 6 to 9 mph.
Tuesday
Increasing clouds, with a high near 63. West wind 9 to 13 mph, with gusts as high as 26 mph.
Tuesday Night
A 30 percent chance of rain, mainly between 7pm and 11pm. Mostly cloudy, with a low around 38. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.
Wednesday
Partly sunny, with a temperature rising to near 41 by 10am, then falling to around 34 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 32 mph.
Wednesday Night
Mostly clear, with a low around 17. North wind 9 to 17 mph, with gusts as high as 28 mph.
Thursday
Mostly sunny, with a high near 32.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Partly sunny, with a high near 31.
Saturday Night
Partly cloudy, with a low around 11.
Sunday
Sunny, with a high near 27.
Sunday Night
Mostly clear, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 36.
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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:
4:46 pm CST Jan 12, 2026
Forecast Valid:
4pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation