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

47°F

8°C

Humidity 41%
Wind Speed S 6 mph
Barometer 30.35 in (1028.0 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 28 Mar 8:53 pm CDT
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Partly cloudy, with a low around 41. South wind around 6 mph.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 72. South wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 72 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57. South wind around 10 mph.

    Low: 57 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 84. South wind 10 to 16 mph, with gusts as high as 26 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain, then a chance of rain and thunderstorms after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.

    High: 86 °F

    Slight Chance
    Rain then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 47. Chance of precipitation is 80%.

    Low: 47 °F

    Rain

  • Wednesday

    Wednesday: Rain likely, mainly before 1pm. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.

    High: 56 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.

    Low: 43 °F

    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 41. South wind around 6 mph.
Sunday
Mostly sunny, with a high near 72. South wind 6 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 57. South wind around 10 mph.
Monday
Sunny, with a high near 84. South wind 10 to 16 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph.
Tuesday
A slight chance of rain, then a chance of rain and thunderstorms after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 47. Chance of precipitation is 80%.
Wednesday
Rain likely, mainly before 1pm. Mostly cloudy, with a high near 56. Chance of precipitation is 60%.
Wednesday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 60%.
Thursday
Rain likely, mainly before 1pm. Mostly cloudy, with a high near 58. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 46.
Friday
A 30 percent chance of rain. Mostly cloudy, with a high near 72.
Friday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 53.
Saturday
Rain likely. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.
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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:
6:01 pm CDT Mar 28, 2026
Forecast Valid:
9pm CDT Mar 28, 2026-6pm CDT Apr 4, 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