Thunderstorms and Heavy Rainfall in the Plains; Hazardous Heat in the South and Southeast

Severe thunderstorms will be possible across the northern/central Plains through Tuesday afternoon and from the central Plains to the Mid-Mississippi Valley Tuesday evening through Wednesday morning. Storms may produce large hail and damaging wind gusts, and heavy rainfall may lead to scattered instances of flash flooding. Meanwhile, hazardous heat persists across the South and Southeast. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

68°F

20°C

Humidity 96%
Wind Speed Calm
Barometer 30.07 in (1017.8 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 17 Aug 11:53 pm CDT
Extended Forecast for

Summerfield IL

  • Overnight

    Overnight: Mostly cloudy early, then gradual clearing, with a low around 64. Calm wind.

    Low: 64 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 85. Calm wind becoming south around 5 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am.  Increasing clouds, with a low around 70. Southeast wind 3 to 5 mph.

    Low: 70 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly between 7am and noon. Some of the storms could produce heavy rainfall.  Mostly cloudy, with a high near 82. South wind 5 to 7 mph becoming light and variable.  Chance of precipitation is 70%.

    High: 82 °F

    Heavy Rain
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely.  Mostly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 60%.

    Low: 68 °F

    T-storms
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 1pm.  Partly sunny, with a high near 82.

    High: 82 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Mostly clear, with a low around 66.

    Low: 66 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly cloudy early, then gradual clearing, with a low around 64. Calm wind.
Tuesday
Sunny, with a high near 85. Calm wind becoming south around 5 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Increasing clouds, with a low around 70. Southeast wind 3 to 5 mph.
Wednesday
Showers and thunderstorms likely, mainly between 7am and noon. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 82. South wind 5 to 7 mph becoming light and variable. Chance of precipitation is 70%.
Wednesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 68. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 82.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 84.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 66.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 64.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Partly cloudy, with a low around 63.
Monday
Partly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Summerfield IL
 38.61°N 89.75°W (Elev. 482 ft)
10:31 pm CDT Aug 17, 2026
12am CDT Aug 18, 2026-6pm CDT Aug 24, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database