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

79°F

26°C

Humidity 47%
Wind Speed Vrbl 3 mph
Barometer 30.04 in (1016.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 10 Oct 1:53 pm CDT
Extended Forecast for

Waterloo IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 77. East wind 5 to 7 mph.

    High: 77 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 53. Southeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 62. Calm wind becoming south around 5 mph in the evening.

    Low: 62 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 5 to 11 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 67.

    Low: 67 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Partly sunny, with a high near 77. East wind 5 to 7 mph.
Tonight
Partly cloudy, with a low around 53. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 86. Calm wind.
Sunday Night
Increasing clouds, with a low around 62. Calm wind becoming south around 5 mph in the evening.
Columbus Day
Sunny, with a high near 93. Southwest wind 5 to 11 mph.
Monday Night
Clear, with a low around 67.
Tuesday
Sunny, with a high near 91.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 68.
Wednesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 70.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Waterloo IL
 38.33°N 90.16°W (Elev. 600 ft)
Last Update:
1:26 pm CDT Oct 10, 2026
Forecast Valid:
2pm CDT Oct 10, 2026-6pm CDT Oct 16, 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