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.

Fog/Mist

54°F

12°C

Humidity 97%
Wind Speed N 8 mph
Barometer 29.91 in (1012.8 mb)
Dewpoint 53°F (12°C)
Visibility 2.00 mi
Wind Chill52°F (11°C)
Last update 21 Nov 7:53 pm CST
Extended Forecast for

Madison IL

  • Tonight

    Tonight: A 30 percent chance of rain, mainly before 2am. Patchy fog between 4am and 5am. Otherwise, cloudy, with a low around 46. North wind 6 to 8 mph.

    Low: 46 °F

    Chance Rain
    and Areas Fog

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 58. North wind 5 to 7 mph becoming west in the afternoon.

    High: 58 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. Southwest wind 3 to 5 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 62. Calm wind.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. Calm wind becoming southeast around 5 mph after midnight.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: Rain likely, mainly after noon. Cloudy, with a high near 58. Chance of precipitation is 70%.

    High: 58 °F

    Chance Rain
    then Rain
    Likely

  • Monday Night

    Monday Night: Rain, mainly before midnight. Low around 51. Chance of precipitation is 80%.

    Low: 51 °F

    Rain then
    Chance Rain

  • Tuesday

    Tuesday: A 20 percent chance of rain. Partly sunny, with a high near 63.

    High: 63 °F

    Slight Chance
    Rain

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 30 percent chance of rain, mainly before 2am. Patchy fog between 4am and 5am. Otherwise, cloudy, with a low around 46. North wind 6 to 8 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 58. North wind 5 to 7 mph becoming west in the afternoon.
Saturday Night
Mostly clear, with a low around 41. Southwest wind 3 to 5 mph.
Sunday
Sunny, with a high near 62. Calm wind.
Sunday Night
Mostly cloudy, with a low around 44. Calm wind becoming southeast around 5 mph after midnight.
Monday
Rain likely, mainly after noon. Cloudy, with a high near 58. Chance of precipitation is 70%.
Monday Night
Rain, mainly before midnight. Low around 51. Chance of precipitation is 80%.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 50.
Wednesday Night
Partly cloudy, with a low around 31.
Thanksgiving Day
Mostly sunny, with a high near 48.
Thursday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 31.
Friday
A 20 percent chance of rain. Mostly sunny, with a high near 46.
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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:
7:31 pm CST Nov 21, 2025
Forecast Valid:
8pm CST Nov 21, 2025-6pm CST Nov 28, 2025
 
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