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

64°F

18°C

Humidity 43%
Wind Speed S 5 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 29 Mar 8:53 pm CDT
Extended Forecast for

Madison IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. South wind 11 to 13 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain, then a chance of rain and thunderstorms after 10am. Mostly sunny, with a high near 87. Southwest wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.

    High: 87 °F

    Slight Chance
    T-storms then
    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1am. Low around 58. Southwest wind 8 to 11 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.

    Low: 58 °F

    Chance Rain
    then Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 70. Chance of precipitation is 80%.

    High: 70 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.

    Low: 54 °F

    Rain

  • Thursday

    Thursday: Rain. High near 68. Chance of precipitation is 80%.

    High: 68 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.

    Low: 49 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 58. South wind 8 to 10 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 65. South wind 11 to 13 mph, with gusts as high as 25 mph.
Tuesday
A slight chance of rain, then a chance of rain and thunderstorms after 10am. Mostly sunny, with a high near 87. Southwest wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 30%.
Tuesday Night
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1am. Low around 58. Southwest wind 8 to 11 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.
Wednesday
Rain and possibly a thunderstorm. High near 70. Chance of precipitation is 80%.
Wednesday Night
Rain and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.
Thursday
Rain. High near 68. Chance of precipitation is 80%.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 75.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 57.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 73. Chance of precipitation is 70%.
Saturday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Chance of precipitation is 60%.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 63.
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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:
8:46 pm CDT Mar 29, 2026
Forecast Valid:
9pm CDT Mar 29, 2026-6pm CDT Apr 5, 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