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

48°F

9°C

Humidity 36%
Wind Speed SW 12 G 18 mph
Barometer 30.07 in (1018.5 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 21 Jan 11:53 am CST
Extended Forecast for

Madison IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 47. West wind 9 to 13 mph, with gusts as high as 23 mph.

    High: 47 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 24. Southwest wind 5 to 11 mph becoming northwest after midnight. Winds could gust as high as 23 mph.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 39. West wind 3 to 5 mph.

    High: 39 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 9. Light northwest wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 24 mph.

    Low: 9 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 16. North wind 11 to 14 mph, with gusts as high as 24 mph.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: Cloudy, with a low around 2.

    Low: 2 °F

    Cloudy

  • Saturday

    Saturday: A 50 percent chance of snow. Cloudy and cold, with a high near 14.

    High: 14 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.

    Low: 8 °F

    Chance Snow
    then Slight
    Chance Snow

  • Sunday

    Sunday: A 20 percent chance of snow before noon. Partly sunny, with a high near 21.

    High: 21 °F

    Slight Chance
    Snow then
    Partly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 47. West wind 9 to 13 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 24. Southwest wind 5 to 11 mph becoming northwest after midnight. Winds could gust as high as 23 mph.
Thursday
Mostly sunny, with a high near 39. West wind 3 to 5 mph.
Thursday Night
Mostly cloudy, with a low around 9. Light northwest wind becoming north 10 to 15 mph after midnight. Winds could gust as high as 24 mph.
Friday
Mostly cloudy and cold, with a high near 16. North wind 11 to 14 mph, with gusts as high as 24 mph.
Friday Night
Cloudy, with a low around 2.
Saturday
A 50 percent chance of snow. Cloudy and cold, with a high near 14.
Saturday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.
Sunday
A 20 percent chance of snow before noon. Partly sunny, with a high near 21.
Sunday Night
Partly cloudy, with a low around 5.
Monday
Sunny, with a high near 24.
Monday Night
Mostly clear, with a low around 10.
Tuesday
Mostly sunny, with a high near 37.
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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:
10:57 am CST Jan 21, 2026
Forecast Valid:
12pm CST Jan 21, 2026-6pm CST Jan 27, 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