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

49°F

9°C

Humidity 35%
Wind Speed W 13 mph
Barometer 30.05 in (1017.8 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 21 Jan 12:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 47. West wind 8 to 13 mph, with gusts as high as 23 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 22. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 23 mph.

    Low: 22 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 39. Northwest wind around 5 mph becoming calm in the morning.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11. Light northeast wind becoming north 11 to 16 mph after midnight. Winds could gust as high as 25 mph.

    Low: 11 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 17. North wind 13 to 16 mph, with gusts as high as 24 mph.

    High: 17 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Cloudy, with a low around 2.

    Low: 2 °F

    Cloudy then
    Slight Chance
    Snow

  • Saturday

    Saturday: A 50 percent chance of snow. Cloudy and cold, with a high near 13.

    High: 13 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Snow likely, mainly before midnight. Mostly cloudy, with a low around 8. Chance of precipitation is 60%.

    Low: 8 °F

    Snow Likely
    then Chance
    Snow

  • Sunday

    Sunday: A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 20.

    High: 20 °F

    Slight Chance
    Snow then
    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 47. West wind 8 to 13 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 22. Southwest wind 5 to 10 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Thursday
Mostly sunny, with a high near 39. Northwest wind around 5 mph becoming calm in the morning.
Thursday Night
Mostly cloudy, with a low around 11. Light northeast wind becoming north 11 to 16 mph after midnight. Winds could gust as high as 25 mph.
Friday
Mostly cloudy and cold, with a high near 17. North wind 13 to 16 mph, with gusts as high as 24 mph.
Friday Night
A 20 percent chance of snow after midnight. Cloudy, with a low around 2.
Saturday
A 50 percent chance of snow. Cloudy and cold, with a high near 13.
Saturday Night
Snow likely, mainly before midnight. Mostly cloudy, with a low around 8. Chance of precipitation is 60%.
Sunday
A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 20.
Sunday Night
Partly cloudy, with a low around 4.
Monday
Sunny, with a high near 24.
Monday Night
Mostly clear, with a low around 9.
Tuesday
Mostly sunny, with a high near 37.
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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:
10:57 am CST Jan 21, 2026
Forecast Valid:
1pm CST Jan 21, 2026-6pm CST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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