Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

51°F

11°C

Humidity 43%
Wind Speed S 9 mph
Barometer 30.03 in (1017.1 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 18 Mar 10:53 am CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Today

    Today: Sunny, with a high near 65. West wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Light and variable wind becoming south around 5 mph after midnight.

    Low: 44 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 72. Southwest wind around 6 mph becoming northwest in the afternoon.

    High: 72 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 48. North wind around 5 mph becoming light and variable  after midnight.

    Low: 48 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 78. West wind 3 to 7 mph.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 55.

    Low: 55 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 65. West wind 7 to 10 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 44. Light and variable wind becoming south around 5 mph after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 72. Southwest wind around 6 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 48. North wind around 5 mph becoming light and variable after midnight.
Friday
Mostly sunny, with a high near 78. West wind 3 to 7 mph.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Sunny, with a high near 79.
Saturday Night
Clear, with a low around 55.
Sunday
Sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Partly sunny, with a high near 53.
Monday Night
Mostly cloudy, with a low around 35.
Tuesday
Partly sunny, with a high near 58.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Waterloo IL
 38.29°N 90.19°W (Elev. 633 ft)
8:52 am CDT Mar 18, 2026
11am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database