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

73°F

23°C

Humidity 50%
Wind Speed S 5 mph
Barometer 29.76 in (1007.4 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 21 Mar 8:53 pm CDT
Extended Forecast for

2 Miles SSE Belleville IL

  • Tonight

    Tonight: Clear, with a low around 62. Southwest wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 89. South wind 7 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 38. Breezy, with a north wind 16 to 21 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 34 mph.

    Low: 38 °F

    Slight Chance
    T-storms and
    Breezy then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 58. North wind 7 to 9 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. East wind around 5 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Clear, with a low around 62. Southwest wind 6 to 8 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 89. South wind 7 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 38. Breezy, with a north wind 16 to 21 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 34 mph.
Monday
Mostly sunny, with a high near 58. North wind 7 to 9 mph.
Monday Night
Mostly cloudy, with a low around 41. East wind around 5 mph.
Tuesday
Mostly sunny, with a high near 63.
Tuesday Night
Mostly cloudy, with a low around 46.
Wednesday
Partly sunny, with a high near 73.
Wednesday Night
A slight chance of rain and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 20%.
Thursday
A 20 percent chance of rain and thunderstorms after 1pm. Sunny, with a high near 84.
Thursday Night
A 30 percent chance of rain and thunderstorms. Partly cloudy, with a low around 46.
Friday
A 40 percent chance of rain. Partly sunny, with a high near 57.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 38.
Saturday
A 20 percent chance of rain. Partly sunny, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Belleville IL
 38.5°N 89.98°W (Elev. 495 ft)
Last Update:
5:26 pm CDT Mar 21, 2026
Forecast Valid:
9pm CDT Mar 21, 2026-6pm CDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation