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

63°F

17°C

Humidity 23%
Wind Speed SE 9 G 22 mph
Barometer 30.20 in (1022.8 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 24 Mar 2:53 pm CDT
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Southeast wind 3 to 6 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 79. Light southeast wind becoming south 5 to 10 mph in the morning.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64. South wind around 9 mph.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Rain, mainly after 1am. Low around 44. Southwest wind 9 to 15 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

    Low: 44 °F

    Chance Rain
    then Rain

  • Friday

    Friday: A 40 percent chance of rain before 1pm. Partly sunny, with a high near 53.

    High: 53 °F

    Chance Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. Southeast wind 3 to 6 mph.
Wednesday
Sunny, with a high near 79. Light southeast wind becoming south 5 to 10 mph in the morning.
Wednesday Night
Mostly clear, with a low around 64. South wind around 9 mph.
Thursday
Sunny, with a high near 91. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.
Thursday Night
Rain, mainly after 1am. Low around 44. Southwest wind 9 to 15 mph becoming north after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 90%.
Friday
A 40 percent chance of rain before 1pm. Partly sunny, with a high near 53.
Friday Night
Mostly clear, with a low around 33.
Saturday
Sunny, with a high near 59.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Partly sunny, with a high near 65.
Sunday Night
Mostly cloudy, with a low around 51.
Monday
Mostly sunny, with a high near 80.
Monday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 59.
Tuesday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 79.
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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:
2:56 pm CDT Mar 24, 2026
Forecast Valid:
3pm CDT Mar 24, 2026-6pm CDT Mar 31, 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