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

84°F

29°C

Humidity 24%
Wind Speed Calm
Barometer 30.05 in (1017.4 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 8 Oct 2:53 pm CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Clear, with a low around 54. Calm wind becoming south around 5 mph after midnight.

    Low: 54 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 88. South wind 5 to 8 mph.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 59. South wind around 6 mph.

    Low: 59 °F

    Clear

  • Saturday

    Saturday: A 20 percent chance of rain after 4pm. Increasing clouds, with a high near 81. Light south wind becoming southeast 5 to 9 mph in the morning.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 50 percent chance of rain, mainly after 7pm. Mostly cloudy, with a low around 59. East wind around 8 mph.

    Low: 59 °F

    Chance Rain

  • Sunday

    Sunday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 54. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 88. South wind 5 to 8 mph.
Friday Night
Clear, with a low around 59. South wind around 6 mph.
Saturday
A 20 percent chance of rain after 4pm. Increasing clouds, with a high near 81. Light south wind becoming southeast 5 to 9 mph in the morning.
Saturday Night
A 50 percent chance of rain, mainly after 7pm. Mostly cloudy, with a low around 59. East wind around 8 mph.
Sunday
Partly sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 59.
Columbus Day
Sunny, with a high near 90.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 81.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 61.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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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:
2:36 pm CDT Oct 8, 2026
Forecast Valid:
3pm CDT Oct 8, 2026-6pm CDT Oct 15, 2026
 
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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