National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

64°F

18°C

Humidity 48%
Wind Speed SE 9 mph
Barometer 30.14 in (1020.4 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 14 May 9:53 am CDT
Extended Forecast for

Madison IL

  • Today

    Today: Sunny, with a high near 77. Southeast wind 3 to 7 mph.

    High: 77 °F

    Sunny

  • Tonight

    Tonight: A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. Southeast wind around 9 mph. Chance of precipitation is 30%.

    Low: 57 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers and thunderstorms likely, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 83. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely then
    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly clear during the early evening, then becoming mostly cloudy, with a low around 67. South wind 7 to 9 mph.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. South wind 7 to 10 mph. Chance of precipitation is 70%.

    High: 86 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Sunny then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 77. Southeast wind 3 to 7 mph.
Tonight
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. Southeast wind around 9 mph. Chance of precipitation is 30%.
Friday
Showers and thunderstorms likely, mainly before 9am. Mostly cloudy, then gradually becoming sunny, with a high near 83. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly clear during the early evening, then becoming mostly cloudy, with a low around 67. South wind 7 to 9 mph.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 86. South wind 7 to 10 mph. Chance of precipitation is 70%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66.
Sunday
Mostly sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 71.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Tuesday
Showers and thunderstorms likely. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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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:
9:01 am CDT May 14, 2026
Forecast Valid:
10am CDT May 14, 2026-6pm CDT May 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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