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

67°F

19°C

Humidity 79%
Wind Speed S 7 mph
Barometer 29.84 in (1010.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 10 Mar 12:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Overnight

    Overnight: Mostly clear, with a low around 62. South wind around 8 mph.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 81. South wind 7 to 15 mph, with gusts as high as 26 mph.

    High: 81 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Cloudy, then gradually becoming partly cloudy, with a low around 57. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 57 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature falling to around 50 by 5pm. Southwest wind 13 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 100%.

    High: 69 °F⇓

    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 33. Northwest wind 8 to 17 mph, with gusts as high as 28 mph.

    Low: 33 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Friday Night

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

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 62. South wind around 8 mph.
Tuesday
Increasing clouds, with a high near 81. South wind 7 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Cloudy, then gradually becoming partly cloudy, with a low around 57. Southwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature falling to around 50 by 5pm. Southwest wind 13 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy, with a low around 33. Northwest wind 8 to 17 mph, with gusts as high as 28 mph.
Thursday
Sunny, with a high near 54.
Thursday Night
Mostly cloudy, with a low around 44.
Friday
Mostly cloudy, with a high near 64.
Friday Night
Mostly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 70.
Saturday Night
Partly cloudy, with a low around 52.
Sunday
A 50 percent chance of rain. Partly sunny, with a high near 66.
Sunday Night
A chance of rain and snow. Partly cloudy, with a low around 29. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 42.
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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:
11:41 pm CDT Mar 9, 2026
Forecast Valid:
1am CDT Mar 10, 2026-6pm CDT Mar 16, 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