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

46°F

8°C

Humidity 61%
Wind Speed SE 3 mph
Barometer 29.94 in (1013.7 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 27 Feb 10:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Mostly clear, with a low around 37. West wind 5 to 7 mph becoming north after midnight.

    Low: 37 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of rain, mainly between 1pm and 3pm. Mostly sunny, with a high near 65. Northeast wind around 7 mph becoming south in the afternoon.

    High: 65 °F

    Mostly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A 20 percent chance of rain between 9pm and 10pm. Partly cloudy, with a low around 31. South wind 6 to 11 mph becoming north after midnight. Winds could gust as high as 20 mph.

    Low: 31 °F

    Slight Chance
    Rain then
    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of rain after noon. Increasing clouds, with a high near 47. Northeast wind around 10 mph.

    High: 47 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain, possibly mixed with snow. Low around 33. East wind around 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow

  • Monday

    Monday: A 50 percent chance of rain, mainly before noon. Mostly cloudy, with a high near 45.

    High: 45 °F

    Chance Rain
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Cloudy, with a low around 39. Chance of precipitation is 60%.

    Low: 39 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain and possibly a thunderstorm. High near 60. Chance of precipitation is 80%.

    High: 60 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely and possibly a thunderstorm. Cloudy, with a low around 49. Chance of precipitation is 70%.

    Low: 49 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 37. West wind 5 to 7 mph becoming north after midnight.
Saturday
A 30 percent chance of rain, mainly between 1pm and 3pm. Mostly sunny, with a high near 65. Northeast wind around 7 mph becoming south in the afternoon.
Saturday Night
A 20 percent chance of rain between 9pm and 10pm. Partly cloudy, with a low around 31. South wind 6 to 11 mph becoming north after midnight. Winds could gust as high as 20 mph.
Sunday
A 20 percent chance of rain after noon. Increasing clouds, with a high near 47. Northeast wind around 10 mph.
Sunday Night
Rain, possibly mixed with snow. Low around 33. East wind around 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday
A 50 percent chance of rain, mainly before noon. Mostly cloudy, with a high near 45.
Monday Night
Rain likely, mainly after midnight. Cloudy, with a low around 39. Chance of precipitation is 60%.
Tuesday
Rain and possibly a thunderstorm. High near 60. Chance of precipitation is 80%.
Tuesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 49. Chance of precipitation is 70%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 63. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 53.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
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Forecast Area
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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:
10:31 pm CST Feb 27, 2026
Forecast Valid:
11pm CST Feb 27, 2026-6pm CST Mar 6, 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