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.

Overcast

77°F

25°C

Humidity 74%
Wind Speed W 6 mph
Barometer 30.03 in (1016.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 14 Oct 3:53 pm CDT
Extended Forecast for

Belleville IL

  • This Afternoon

    This Afternoon: A 30 percent chance of rain, mainly after 5pm. Partly sunny, with a high near 79. Northwest wind around 6 mph.

    High: 79 °F

    Chance Rain

  • Tonight

    Tonight: A slight chance of rain, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 68. Light and variable wind. Chance of precipitation is 40%.

    Low: 68 °F

    Slight Chance
    Rain then
    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 1pm. High near 84. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 80%.

    High: 84 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. West wind 8 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.

    Low: 51 °F

    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, with a high near 57. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 29 mph.

    High: 57 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of rain, mainly after 5pm. Partly sunny, with a high near 79. Northwest wind around 6 mph.
Tonight
A slight chance of rain, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 68. Light and variable wind. Chance of precipitation is 40%.
Thursday
Showers and thunderstorms, mainly before 1pm. High near 84. Light and variable wind becoming south 5 to 10 mph in the morning. Chance of precipitation is 80%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 51. West wind 8 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Friday
Mostly cloudy, with a high near 57. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 29 mph.
Friday Night
Mostly cloudy, with a low around 41.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 43.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 51.
Wednesday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.52°N 90.01°W (Elev. 535 ft)
Last Update:
4:46 pm CDT Oct 14, 2026
Forecast Valid:
4pm CDT Oct 14, 2026-6pm CDT Oct 21, 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