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

45°F

7°C

Humidity 77%
Wind Speed NW 18 G 33 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 11 Mar 4:53 pm CDT
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 31. Blustery, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.

    Low: 31 °F

    Decreasing
    Clouds and
    Blustery then
    Clear

  • Thursday

    Thursday: Sunny, with a high near 54. West wind 5 to 8 mph.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 43. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 43 °F

    Mostly Clear
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 62. Southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 62 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36. Northwest wind around 6 mph becoming northeast after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms, then rain likely after 1pm. Mostly cloudy, with a high near 66. Breezy. Chance of precipitation is 70%.

    High: 66 °F

    Rain Likely
    and Breezy

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 25. Blustery. Chance of precipitation is 30%.

    Low: 25 °F

    Chance
    Rain/Snow and
    Blustery

Detailed Forecast

Tonight
Cloudy during the early evening, then gradual clearing, with a low around 31. Blustery, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 31 mph.
Thursday
Sunny, with a high near 54. West wind 5 to 8 mph.
Thursday Night
Mostly clear, with a low around 43. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
Partly sunny, with a high near 62. Southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 36. Northwest wind around 6 mph becoming northeast after midnight.
Saturday
Partly sunny, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
A chance of rain and thunderstorms, then rain likely after 1pm. Mostly cloudy, with a high near 66. Breezy. Chance of precipitation is 70%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 25. Blustery. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 37. Breezy.
Monday Night
Mostly clear, with a low around 19.
Tuesday
Partly sunny, with a high near 43.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 57.
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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:
3:01 pm CDT Mar 11, 2026
Forecast Valid:
5pm CDT Mar 11, 2026-6pm CDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation