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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

4 Miles SW Waterloo IL

  • Overnight

    Overnight: Mostly clear, with a low around 30. North wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 48. Northeast wind around 11 mph, with gusts as high as 20 mph.

    High: 48 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Rain, possibly mixed with snow and sleet before 2am, then rain, possibly mixed with sleet between 2am and 3am, then rain after 3am. Low around 34. East wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. Little or no snow and sleet accumulation expected.

    Low: 34 °F

    Wintry Mix

  • Monday

    Monday: Rain likely, mainly before 9am, then a slight chance of showers after noon. Cloudy, with a high near 47. East wind 6 to 10 mph. Chance of precipitation is 60%.

    High: 47 °F

    Rain Likely
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely. Cloudy, with a low around 42. East wind 6 to 9 mph becoming south after midnight. Chance of precipitation is 70%.

    Low: 42 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely, mainly before noon. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 69. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly clear, with a low around 30. North wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday
Increasing clouds, with a high near 48. Northeast wind around 11 mph, with gusts as high as 20 mph.
Sunday Night
Rain, possibly mixed with snow and sleet before 2am, then rain, possibly mixed with sleet between 2am and 3am, then rain after 3am. Low around 34. East wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. Little or no snow and sleet accumulation expected.
Monday
Rain likely, mainly before 9am, then a slight chance of showers after noon. Cloudy, with a high near 47. East wind 6 to 10 mph. Chance of precipitation is 60%.
Monday Night
Showers likely. Cloudy, with a low around 42. East wind 6 to 9 mph becoming south after midnight. Chance of precipitation is 70%.
Tuesday
Showers likely, mainly before noon. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Tuesday Night
Showers likely, mainly after midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 69. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Showers likely, mainly before noon. Partly sunny, with a high near 70. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Friday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 54. Chance of precipitation is 70%.
Saturday
Showers likely. Cloudy, with a high near 65. Chance of precipitation is 70%.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Waterloo IL
 38.29°N 90.19°W (Elev. 633 ft)
Last Update:
1:36 am CST Mar 1, 2026
Forecast Valid:
2am CST Mar 1, 2026-6pm CST Mar 7, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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