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

53°F

12°C

Humidity 43%
Wind Speed SE 8 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 25 Mar 12:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 43. South wind around 6 mph.

    Low: 43 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. Southwest wind 5 to 11 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 63. South wind 10 to 13 mph, with gusts as high as 22 mph.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 88. Southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    High: 88 °F

    Sunny

  • Thursday Night

    Thursday Night: Rain, mainly after 1am. Low around 44. Southwest wind 10 to 16 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    Low: 44 °F

    Chance Rain
    then Rain

  • Friday

    Friday: A 50 percent chance of rain before 1pm. Mostly cloudy, with a high near 50.

    High: 50 °F

    Chance Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 43. South wind around 6 mph.
Wednesday
Mostly sunny, with a high near 77. Southwest wind 5 to 11 mph.
Wednesday Night
Mostly clear, with a low around 63. South wind 10 to 13 mph, with gusts as high as 22 mph.
Thursday
Sunny, with a high near 88. Southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Thursday Night
Rain, mainly after 1am. Low around 44. Southwest wind 10 to 16 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Friday
A 50 percent chance of rain before 1pm. Mostly cloudy, with a high near 50.
Friday Night
Mostly clear, with a low around 31.
Saturday
Sunny, with a high near 58.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Partly sunny, with a high near 64.
Sunday Night
Mostly cloudy, with a low around 49.
Monday
Mostly sunny, with a high near 78.
Monday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 58.
Tuesday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 78.
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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:
12:06 am CDT Mar 25, 2026
Forecast Valid:
1am CDT Mar 25, 2026-6pm CDT Mar 31, 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