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

53°F

12°C

Humidity 38%
Wind Speed SE 8 mph
Barometer 30.07 in (1018.6 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 13 Feb 5:53 pm CST
Extended Forecast for

4 Miles SW Waterloo IL

  • Tonight

    Tonight: Increasing clouds, with a low around 40. South wind 5 to 8 mph becoming calm after midnight.

    Low: 40 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain, mainly after 9am. High near 50. Light and variable wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.

    High: 50 °F

    Rain

  • Saturday Night

    Saturday Night: Rain, mainly before 5am. Low around 44. East wind 7 to 9 mph becoming northeast after midnight. Chance of precipitation is 90%.

    Low: 44 °F

    Rain

  • Sunday

    Sunday: A 30 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 56. Northeast wind 6 to 10 mph.

    High: 56 °F

    Chance Rain
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38. North wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 40. South wind 5 to 8 mph becoming calm after midnight.
Saturday
Rain, mainly after 9am. High near 50. Light and variable wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.
Saturday Night
Rain, mainly before 5am. Low around 44. East wind 7 to 9 mph becoming northeast after midnight. Chance of precipitation is 90%.
Sunday
A 30 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 56. Northeast wind 6 to 10 mph.
Sunday Night
Mostly clear, with a low around 38. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 62.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Partly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 59.
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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:
4:56 pm CST Feb 13, 2026
Forecast Valid:
6pm CST Feb 13, 2026-6pm CST Feb 20, 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