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.

Partly Cloudy

85°F

29°C

Humidity 80%
Wind Speed E 5 mph
Barometer 29.93 in (1013.0 mb)
Dewpoint 78°F (26°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 25 Jul 7:53 pm CDT
Extended Forecast for

Belleville IL

Heat Advisory July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Partly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Partly Cloudy

  • Sunday

    Sunday: Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 109. Light southwest wind. Chance of precipitation is 20%.

    High: 95 °F

    Mostly Sunny
    then Isolated
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 98. Heat index values as high as 113. Southwest wind 5 to 9 mph.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. Southwest wind around 7 mph.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 74. Calm wind.
Sunday
Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 109. Light southwest wind. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.
Monday
Mostly sunny and hot, with a high near 98. Heat index values as high as 113. Southwest wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 78. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Sunny, with a high near 89.
Wednesday Night
Mostly clear, with a low around 69.
Thursday
Sunny, with a high near 89.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 89.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.53°N 90.04°W (Elev. 554 ft)
Last Update:
5:56 pm CDT Jul 25, 2026
Forecast Valid:
8pm CDT Jul 25, 2026-6pm CDT Aug 1, 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