Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Thunderstorm Light Rain Fog/Mist

73°F

23°C

Humidity 94%
Wind Speed W 8 mph
Barometer 29.97 in (1014.5 mb)
Dewpoint 71°F (22°C)
Visibility 5.00 mi
Last update 19 Aug 6:53 am CDT
Extended Forecast for

3 Miles NW Belleville IL

  • Today

    Today: Showers and possibly a thunderstorm before 11am, then scattered showers and thunderstorms, mainly between 11am and 1pm.  High near 82. South wind 3 to 6 mph.  Chance of precipitation is 80%.

    High: 82 °F

    Showers then
    Scattered
    Showers

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before midnight.  Mostly cloudy, with a low around 69. Light north wind.  Chance of precipitation is 30%.

    Low: 69 °F

    Scattered
    T-storms

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms before 1pm.  Mostly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm before 11am, then scattered showers and thunderstorms, mainly between 11am and 1pm. High near 82. South wind 3 to 6 mph. Chance of precipitation is 80%.
Tonight
Scattered showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 69. Light north wind. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 87. Light and variable wind.
Friday Night
Mostly clear, with a low around 68.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 66.
Monday
Partly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Belleville IL
 38.55°N 90.04°W (Elev. 538 ft)
6:21 am CDT Aug 19, 2026
7am CDT Aug 19, 2026-6pm CDT Aug 25, 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