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

55°F

13°C

Humidity 53%
Wind Speed NE 7 mph
Barometer 30.21 in (1023.0 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 19 Apr 9:53 pm CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Partly cloudy, with a low around 40. Northeast wind 5 to 7 mph.

    Low: 40 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 68. Southeast wind 5 to 7 mph.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Southeast wind 7 to 9 mph becoming south after midnight.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 77. Southwest wind 8 to 14 mph, with gusts as high as 23 mph.

    High: 77 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 56. Southwest wind 8 to 10 mph.

    Low: 56 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 40. Northeast wind 5 to 7 mph.
Monday
Sunny, with a high near 68. Southeast wind 5 to 7 mph.
Monday Night
Mostly clear, with a low around 50. Southeast wind 7 to 9 mph becoming south after midnight.
Tuesday
Sunny, with a high near 77. Southwest wind 8 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Clear, with a low around 56. Southwest wind 8 to 10 mph.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
Mostly sunny, with a high near 80.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 70.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 69.
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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:
9:21 pm CDT Apr 19, 2026
Forecast Valid:
10pm CDT Apr 19, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation