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.

Overcast

52°F

11°C

Humidity 80%
Wind Speed N 15 mph
Barometer 30.42 in (1030.2 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 16 Oct 9:53 pm CDT
Extended Forecast for

Waterloo IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, sunny, with a high near 60. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 60 °F

    Patchy Frost
    then Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 2am. Otherwise, clear, with a low around 35. Calm wind.

    Low: 35 °F

    Clear then
    Patchy Frost

  • Sunday

    Sunday: Areas of frost before 9am. Otherwise, sunny, with a high near 65. Calm wind becoming south around 5 mph in the morning.

    High: 65 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 37. Calm wind.

    Low: 37 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 9 to 13 mph, with gusts as high as 20 mph.
Saturday
Patchy frost before 8am. Otherwise, sunny, with a high near 60. North wind 5 to 7 mph becoming calm in the afternoon.
Saturday Night
Patchy frost after 2am. Otherwise, clear, with a low around 35. Calm wind.
Sunday
Areas of frost before 9am. Otherwise, sunny, with a high near 65. Calm wind becoming south around 5 mph in the morning.
Sunday Night
Clear, with a low around 37. Calm wind.
Monday
Sunny, with a high near 70.
Monday Night
Mostly clear, with a low around 40.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 75.
Wednesday Night
Clear, with a low around 46.
Thursday
Sunny, with a high near 79.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.31°N 90.16°W (Elev. 597 ft)
Last Update:
10:36 pm CDT Oct 16, 2026
Forecast Valid:
10pm CDT Oct 16, 2026-6pm CDT Oct 23, 2026
 
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Additional Resources

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