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.

Rain Fog/Mist

70°F

21°C

Humidity 97%
Wind Speed Vrbl 3 mph
Barometer 29.97 in (1014.4 mb)
Dewpoint 69°F (21°C)
Visibility 2.00 mi
Last update 26 Jun 4:53 am CDT
Extended Forecast for

Belleville IL

Flood Watch June 26, 05:14am until June 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 26, 05:14am until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Overnight

    Low: 70 °F

    Heavy Rain

  • Friday

    Friday: Showers and possibly a thunderstorm before 3pm, then showers and thunderstorms likely after 3pm. Some of the storms could produce heavy rainfall. High near 81. Southeast wind 7 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Heavy Rain
    then T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 69. West wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southeast wind 3 to 5 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 70. Southeast wind around 5 mph. Chance of precipitation is 90%.
Friday
Showers and possibly a thunderstorm before 3pm, then showers and thunderstorms likely after 3pm. Some of the storms could produce heavy rainfall. High near 81. Southeast wind 7 to 9 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely, mainly before 11pm. Mostly cloudy, with a low around 69. West wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southeast wind 3 to 5 mph. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
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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:
3:36 am CDT Jun 26, 2026
Forecast Valid:
5am CDT Jun 26, 2026-6pm CDT Jul 2, 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