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.

Overcast

68°F

20°C

Humidity 100%
Wind Speed SE 5 mph
Barometer 30.01 in (1016.0 mb)
Dewpoint 68°F (20°C)
Visibility 8.00 mi
Last update 15 Oct 6:53 am CDT
Extended Forecast for

Madison IL

  • Today

    Today: Showers and thunderstorms before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 82. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then scattered 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: Cloudy, then gradually becoming partly cloudy, with a low around 41. North wind 9 to 17 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 62. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and thunderstorms before 10am, then showers likely and possibly a thunderstorm between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 82. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms likely before 1am, then scattered 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
Cloudy, then gradually becoming partly cloudy, with a low around 41. North wind 9 to 17 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 62. North wind 5 to 7 mph becoming calm in the afternoon.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 42.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 79.
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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:
5:11 am CDT Oct 15, 2026
Forecast Valid:
6am CDT Oct 15, 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