Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Mostly Cloudy

70°F

21°C

Humidity 87%
Wind Speed NW 3 mph
Barometer 30.04 in (1016.8 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 22 Aug 11:53 pm CDT
Extended Forecast for

Belleville IL

  • Overnight

    Overnight: Mostly clear, with a low around 65. Light north wind.

    Low: 65 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 83. North wind 3 to 8 mph.

    High: 83 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Cloudy, then gradual clearing toward daybreak, with a low around 61. North wind around 5 mph becoming calm  in the evening.

    Low: 61 °F

    Clearing Late

  • Monday

    Monday: Increasing clouds, with a high near 83. Southeast wind 3 to 5 mph.

    High: 83 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A slight chance of showers, with thunderstorms also possible after 10pm.  Partly cloudy, with a low around 66. East wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 65. Light north wind.
Sunday
Increasing clouds, with a high near 83. North wind 3 to 8 mph.
Sunday Night
Cloudy, then gradual clearing toward daybreak, with a low around 61. North wind around 5 mph becoming calm in the evening.
Monday
Increasing clouds, with a high near 83. Southeast wind 3 to 5 mph.
Monday Night
A slight chance of showers, with thunderstorms also possible after 10pm. Partly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Partly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
Sunny, with a high near 89.
Thursday Night
Mostly clear, with a low around 67.
Friday
Sunny, with a high near 87.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 89.
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ABOUT THIS FORECAST

 
Point Forecast:
Belleville IL
 38.52°N 90.01°W (Elev. 535 ft)
11:16 pm CDT Aug 22, 2026
12am CDT Aug 23, 2026-6pm CDT Aug 29, 2026
 
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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