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.

Mostly Cloudy

74°F

23°C

Humidity 91%
Wind Speed NW 3 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 14 Oct 9:53 am CDT
Extended Forecast for

Belleville IL

  • Today

    Today: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 79. North wind around 6 mph. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 67. North wind around 6 mph becoming light and variable.

    Low: 67 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy through mid morning, then gradual clearing, with a high near 84. East wind 6 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 60%.

    High: 84 °F

    Showers
    Likely then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 52. Southwest wind 8 to 18 mph becoming northwest after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.

    Low: 52 °F

    Showers

  • Friday

    Friday: Mostly sunny, with a high near 60. Breezy, with a northwest wind 20 to 22 mph, with gusts as high as 30 mph.

    High: 60 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. High near 79. North wind around 6 mph. Chance of precipitation is 80%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 67. North wind around 6 mph becoming light and variable.
Thursday
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. Cloudy through mid morning, then gradual clearing, with a high near 84. East wind 6 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 60%.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 52. Southwest wind 8 to 18 mph becoming northwest after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 60. Breezy, with a northwest wind 20 to 22 mph, with gusts as high as 30 mph.
Friday Night
Mostly clear, with a low around 40.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 46.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 50.
Tuesday
Mostly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.52°N 90.01°W (Elev. 535 ft)
Last Update:
5:06 am CDT Oct 14, 2026
Forecast Valid:
10am CDT Oct 14, 2026-6pm CDT Oct 20, 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