National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

A Few Clouds

60°F

16°C

Humidity 53%
Wind Speed S 9 mph
Barometer 29.87 in (1011.4 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 15 May 5:53 am CDT
Extended Forecast for

Belleville IL

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly before 9am. Partly sunny, with a high near 84. South wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 84 °F

    Chance
    T-storms then
    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 67. South wind around 9 mph.

    Low: 67 °F

    Mostly Cloudy

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South wind around 9 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 66. South wind around 8 mph.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 90. South wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.

    High: 87 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly before 9am. Partly sunny, with a high near 84. South wind 9 to 14 mph, with gusts as high as 22 mph.
Tonight
Mostly cloudy, with a low around 67. South wind around 9 mph.
Saturday
Showers and thunderstorms likely, mainly before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. South wind around 9 mph. Chance of precipitation is 60%.
Saturday Night
Partly cloudy, with a low around 66. South wind around 8 mph.
Sunday
Sunny, with a high near 90. South wind 9 to 16 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 70.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. Chance of precipitation is 70%.
Tuesday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.52°N 89.98°W (Elev. 509 ft)
Last Update:
5:30 am CDT May 15, 2026
Forecast Valid:
6am CDT May 15, 2026-6pm CDT May 21, 2026
 
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Additional Resources

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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