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.

Overcast

65°F

18°C

Humidity 73%
Wind Speed N 3 mph
Barometer 29.95 in (1013.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 3 Apr 3:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Today

    Today: A slight chance of showers between 9am and 10am, then a slight chance of showers and thunderstorms after 10am. Partly sunny, with a high near 81. South wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 58. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

    Low: 58 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 1pm, then a slight chance of showers between 1pm and 4pm. Temperature falling to around 57 by noon. West wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

    High: 63 °F⇓

    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 40. Northwest wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 59. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 54.

    High: 54 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers between 9am and 10am, then a slight chance of showers and thunderstorms after 10am. Partly sunny, with a high near 81. South wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 58. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Saturday
Showers and possibly a thunderstorm before 1pm, then a slight chance of showers between 1pm and 4pm. Temperature falling to around 57 by noon. West wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Saturday Night
Partly cloudy, with a low around 40. Northwest wind 8 to 13 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 59. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 39.
Monday
Sunny, with a high near 62.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly sunny, with a high near 54.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 75.
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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:
4:51 am CDT Apr 3, 2026
Forecast Valid:
6am CDT Apr 3, 2026-6pm CDT Apr 9, 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