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

21°F

-6°C

Humidity 27%
Wind Speed NW 14 mph
Barometer 30.41 in (1030.4 mb)
Dewpoint -8°F (-22°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 19 Jan 3:53 pm CST
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Mostly clear, with a low around 13. Northwest wind around 6 mph becoming light and variable in the evening.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 39. Light south wind increasing to 5 to 10 mph in the morning.

    High: 39 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 31. South wind 9 to 11 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 7 to 11 mph, with gusts as high as 21 mph.

    High: 46 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. West wind around 7 mph becoming northwest after midnight.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 19.

    High: 19 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 2.

    Low: 2 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 13. Northwest wind around 6 mph becoming light and variable in the evening.
Tuesday
Mostly sunny, with a high near 39. Light south wind increasing to 5 to 10 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 31. South wind 9 to 11 mph, with gusts as high as 25 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 7 to 11 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 24. West wind around 7 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
Mostly cloudy and cold, with a high near 19.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 2.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 15.
Saturday Night
A 30 percent chance of snow. Partly cloudy, with a low around 5.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Mostly clear, with a low around 11.
Monday
Sunny, with a high near 35.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Madison IL
 38.68°N 90.14°W (Elev. 407 ft)
Last Update:
3:16 pm CST Jan 19, 2026
Forecast Valid:
4pm CST Jan 19, 2026-6pm CST Jan 26, 2026
 
Forecast Discussion
 
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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