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

61°F

16°C

Humidity 43%
Wind Speed E 3 mph
Barometer 29.86 in (1011.2 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 26 Feb 4:53 pm CST
Extended Forecast for

Belleville IL

  • Tonight

    Tonight: Mostly clear, with a low around 38. Light southwest wind.

    Low: 38 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 69. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. South wind 5 to 7 mph becoming light and variable after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 64. Light and variable wind becoming northeast 5 to 9 mph in the morning.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. North wind around 10 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain and snow after noon. Mostly cloudy, with a high near 43. Chance of precipitation is 40%.

    High: 43 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow. Low around 30. Chance of precipitation is 80%.

    Low: 30 °F

    Rain/Snow

  • Monday

    Monday: A slight chance of rain and snow before noon. Mostly cloudy, with a high near 41. Chance of precipitation is 20%.

    High: 41 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 38. Light southwest wind.
Friday
Sunny, with a high near 69. Light southwest wind increasing to 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 41. South wind 5 to 7 mph becoming light and variable after midnight.
Saturday
Mostly sunny, with a high near 64. Light and variable wind becoming northeast 5 to 9 mph in the morning.
Saturday Night
Partly cloudy, with a low around 30. North wind around 10 mph, with gusts as high as 20 mph.
Sunday
A chance of rain and snow after noon. Mostly cloudy, with a high near 43. Chance of precipitation is 40%.
Sunday Night
Rain and snow. Low around 30. Chance of precipitation is 80%.
Monday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 41. Chance of precipitation is 20%.
Monday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 31.
Tuesday
Rain likely, mainly before noon. Cloudy, with a high near 47. Chance of precipitation is 60%.
Tuesday Night
Rain likely. Cloudy, with a low around 39. Chance of precipitation is 60%.
Wednesday
Rain likely. Cloudy, with a high near 57. Chance of precipitation is 60%.
Wednesday Night
Rain likely. Cloudy, with a low around 49. Chance of precipitation is 60%.
Thursday
Rain likely. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.52°N 89.98°W (Elev. 509 ft)
Last Update:
4:51 pm CST Feb 26, 2026
Forecast Valid:
5pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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