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

68°F

20°C

Humidity 51%
Wind Speed E 5 mph
Barometer 29.88 in (1011.5 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 21 Mar 9:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Today

    Today: Sunny, with a high near 87. Southeast wind around 5 mph becoming calm in the afternoon.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 88. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 22 mph.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 39. Breezy, with a north wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    Low: 39 °F

    Chance
    Showers and
    Breezy

  • Monday

    Monday: Mostly sunny, with a high near 57. Northeast wind 8 to 10 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

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

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71.

    High: 71 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 87. Southeast wind around 5 mph becoming calm in the afternoon.
Tonight
Mostly clear, with a low around 64. Southwest wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Mostly sunny, with a high near 88. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 39. Breezy, with a north wind 14 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 57. Northeast wind 8 to 10 mph.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 44.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 56.
Thursday
A 20 percent chance of showers. Sunny, with a high near 81.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 47.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 58.
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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:
9:41 am CDT Mar 21, 2026
Forecast Valid:
10am CDT Mar 21, 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