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

13°F

-11°C

Humidity 67%
Wind Speed Calm
Barometer 30.49 in (1033.5 mb)
Dewpoint 4°F (-16°C)
Visibility 10.00 mi
Last update 31 Jan 9:53 pm CST
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Mostly clear, with a low around 2. West wind 3 to 6 mph.

    Low: 2 °F

    Mostly Clear

  • Sunday

    Sunday: A 40 percent chance of snow, mainly after 3pm. Increasing clouds, with a high near 30. Light southwest wind becoming south 5 to 9 mph in the morning.

    High: 30 °F

    Partly Sunny
    then Chance
    Snow

  • Sunday Night

    Sunday Night: A 40 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 19. South wind 5 to 7 mph becoming light and variable after midnight.

    Low: 19 °F

    Chance Snow
    then Partly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 38. Calm wind becoming west around 5 mph.

    High: 38 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 27. Light east wind.

    Low: 27 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 34.

    High: 34 °F

    Chance Snow

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 12.

    Low: 12 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 2. West wind 3 to 6 mph.
Sunday
A 40 percent chance of snow, mainly after 3pm. Increasing clouds, with a high near 30. Light southwest wind becoming south 5 to 9 mph in the morning.
Sunday Night
A 40 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 19. South wind 5 to 7 mph becoming light and variable after midnight.
Monday
Mostly sunny, with a high near 38. Calm wind becoming west around 5 mph.
Monday Night
Mostly cloudy, with a low around 27. Light east wind.
Tuesday
A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 34.
Tuesday Night
Mostly cloudy, with a low around 15.
Wednesday
Mostly sunny, with a high near 29.
Wednesday Night
Partly cloudy, with a low around 12.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Mostly sunny, with a high near 45.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Mostly sunny, with a high near 37.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Madison IL
 38.68°N 90.14°W (Elev. 407 ft)
Last Update:
9:56 pm CST Jan 31, 2026
Forecast Valid:
10pm CST Jan 31, 2026-6pm CST Feb 7, 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