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

68°F

20°C

Humidity 96%
Wind Speed Calm
Barometer 30.03 in (1016.7 mb)
Dewpoint 67°F (19°C)
Visibility 8.00 mi
Last update 14 Oct 9:53 pm CDT
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Scattered showers, mainly after 4am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 30%.

    Low: 68 °F

    Cloudy then
    Scattered
    Showers

  • Thursday

    Thursday: Scattered showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 82. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then a chance of showers between 1am and 2am. Increasing clouds, with a low around 49. Southwest wind 11 to 16 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Friday

    Friday: Partly sunny, with a high near 58. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 29 mph.

    High: 58 °F

    Partly Sunny
    and Breezy
    then Partly
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41. Northwest wind 8 to 16 mph, with gusts as high as 23 mph.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Scattered showers, mainly after 4am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms before 8am, then showers likely and possibly a thunderstorm between 8am and 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 82. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 70%.
Thursday Night
Showers and thunderstorms likely before 1am, then a chance of showers between 1am and 2am. Increasing clouds, with a low around 49. Southwest wind 11 to 16 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.
Friday
Partly sunny, with a high near 58. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 29 mph.
Friday Night
Mostly cloudy, with a low around 41. Northwest wind 8 to 16 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 43.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Mostly clear, with a low around 52.
Wednesday
Sunny, with a high near 81.
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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:
10:21 pm CDT Oct 14, 2026
Forecast Valid:
10pm CDT Oct 14, 2026-6pm CDT Oct 21, 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