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

16°F

-9°C

Humidity 59%
Wind Speed N 15 mph
Barometer 30.56 in (1035.3 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Wind Chill1°F (-17°C)
Last update 23 Feb 5:53 am CST
Extended Forecast for

4 Miles S Waterloo IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 31. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 31 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 19. Light and variable wind becoming south 5 to 10 mph after midnight.

    Low: 19 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 52. Breezy, with a south wind 11 to 21 mph, with gusts as high as 31 mph.

    High: 52 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. Southwest wind 6 to 14 mph becoming northwest after midnight. Winds could gust as high as 22 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 53. Northwest wind around 6 mph becoming southeast in the afternoon.

    High: 53 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.

    Low: 37 °F

    Slight Chance
    Rain then
    Rain Likely

  • Thursday

    Thursday: A 40 percent chance of rain before noon. Partly sunny, with a high near 48.

    High: 48 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 31. Northwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 19. Light and variable wind becoming south 5 to 10 mph after midnight.
Tuesday
Partly sunny, with a high near 52. Breezy, with a south wind 11 to 21 mph, with gusts as high as 31 mph.
Tuesday Night
Mostly cloudy, with a low around 35. Southwest wind 6 to 14 mph becoming northwest after midnight. Winds could gust as high as 22 mph.
Wednesday
Mostly sunny, with a high near 53. Northwest wind around 6 mph becoming southeast in the afternoon.
Wednesday Night
A slight chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain before noon. Partly sunny, with a high near 48.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 61.
Friday Night
Clear, with a low around 39.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Waterloo IL
 38.26°N 90.16°W (Elev. 659 ft)
Last Update:
5:31 am CST Feb 23, 2026
Forecast Valid:
6am CST Feb 23, 2026-6pm CST Mar 1, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation