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

33°F

1°C

Humidity 33%
Wind Speed S 10 mph
Barometer 30.21 in (1023.6 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 20 Jan 7:53 pm CST
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 29. South wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 44. West wind 8 to 11 mph, with gusts as high as 20 mph.

    High: 44 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. Southwest wind 6 to 9 mph becoming northwest after midnight. Winds could gust as high as 21 mph.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 38. Northwest wind around 6 mph becoming calm in the afternoon.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 10. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.

    Low: 10 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 17.

    High: 17 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.

    Low: 3 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 15.

    High: 15 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 9.

    Low: 9 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly cloudy, with a low around 29. South wind 9 to 11 mph, with gusts as high as 21 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 44. West wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 24. Southwest wind 6 to 9 mph becoming northwest after midnight. Winds could gust as high as 21 mph.
Thursday
Partly sunny, with a high near 38. Northwest wind around 6 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, with a low around 10. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.
Friday
Mostly cloudy and cold, with a high near 17.
Friday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.
Saturday
A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 15.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 9.
Sunday
Partly sunny, with a high near 23.
Sunday Night
Partly cloudy, with a low around 7.
Monday
Mostly sunny, with a high near 26.
Monday Night
Partly cloudy, with a low around 12.
Tuesday
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:
7:01 pm CST Jan 20, 2026
Forecast Valid:
8pm CST Jan 20, 2026-6pm CST Jan 27, 2026
 
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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