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.

Partly Cloudy

28°F

-2°C

Humidity 41%
Wind Speed S 10 mph
Barometer 30.44 in (1031.4 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 20 Jan 10:53 am CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Today

    Today: Sunny, with a high near 36. South wind 9 to 13 mph, with gusts as high as 20 mph.

    High: 36 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 28. South wind 10 to 13 mph, with gusts as high as 23 mph.

    Low: 28 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 47. West wind 7 to 10 mph, with gusts as high as 21 mph.

    High: 47 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. West wind 6 to 8 mph becoming northwest after midnight.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 38. Northwest wind 3 to 6 mph.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 20.

    High: 20 °F

    Cold

  • Friday Night

    Friday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 4.

    Low: 4 °F

    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow. Mostly cloudy and cold, with a high near 15.

    High: 15 °F

    Chance Snow

Detailed Forecast

Today
Sunny, with a high near 36. South wind 9 to 13 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 28. South wind 10 to 13 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 47. West wind 7 to 10 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 24. West wind 6 to 8 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 38. Northwest wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 14.
Friday
Mostly cloudy and cold, with a high near 20.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 4.
Saturday
A 40 percent chance of snow. Mostly cloudy and cold, with a high near 15.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 24.
Sunday Night
Mostly clear, with a low around 7.
Monday
Sunny, with a high near 29.
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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:
10:51 am CST Jan 20, 2026
Forecast Valid:
11am CST Jan 20, 2026-6pm CST Jan 26, 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