National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

88°F

31°C

Humidity 18%
Wind Speed W 10 mph
Barometer 29.81 in (1009.2 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 20 Mar 5:53 pm CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Partly cloudy, with a low around 53. West wind 5 to 7 mph becoming light and variable after midnight.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 83. Light and variable wind becoming southeast around 5 mph in the afternoon.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 62. South wind 6 to 10 mph.

    Low: 62 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South wind 10 to 13 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 40. North wind 14 to 16 mph, with gusts as high as 25 mph.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 53. West wind 5 to 7 mph becoming light and variable after midnight.
Saturday
Sunny, with a high near 83. Light and variable wind becoming southeast around 5 mph in the afternoon.
Saturday Night
Clear, with a low around 62. South wind 6 to 10 mph.
Sunday
Sunny, with a high near 86. South wind 10 to 13 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 40. North wind 14 to 16 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 57.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 43.
Wednesday
Partly sunny, with a high near 67.
Wednesday Night
Partly cloudy, with a low around 51.
Thursday
A 20 percent chance of rain. Sunny, with a high near 79.
Thursday Night
A 50 percent chance of rain. Partly cloudy, with a low around 41.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 53.
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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:
1:56 pm CDT Mar 20, 2026
Forecast Valid:
6pm CDT Mar 20, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation