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

50°F

10°C

Humidity 66%
Wind Speed SE 7 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 16 Feb 8:53 pm CST
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. South wind around 7 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 66. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 66 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 5am. Cloudy, then gradually becoming partly cloudy, with a low around 56. Breezy, with a south wind 16 to 21 mph, with gusts as high as 36 mph.

    Low: 56 °F

    Breezy.
    Cloudy then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 72. West wind 6 to 14 mph, with gusts as high as 26 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 48. South wind around 6 mph.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: A 40 percent chance of showers. Mostly sunny, with a high near 73.

    High: 73 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.

    Low: 38 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 43. South wind around 7 mph.
Tuesday
Cloudy, with a high near 66. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 31 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 5am. Cloudy, then gradually becoming partly cloudy, with a low around 56. Breezy, with a south wind 16 to 21 mph, with gusts as high as 36 mph.
Wednesday
Sunny, with a high near 72. West wind 6 to 14 mph, with gusts as high as 26 mph.
Wednesday Night
Mostly clear, with a low around 48. South wind around 6 mph.
Thursday
A 40 percent chance of showers. Mostly sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.
Friday
Mostly sunny, with a high near 52.
Friday Night
Partly cloudy, with a low around 31.
Saturday
Mostly sunny, with a high near 49.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 28.
Sunday
Sunny, with a high near 42.
Sunday Night
Mostly clear, with a low around 22.
Monday
Mostly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
8:42 pm CST Feb 16, 2026
Forecast Valid:
9pm CST Feb 16, 2026-6pm CST Feb 23, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation