National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

A Few Clouds

76°F

24°C

Humidity 94%
Wind Speed E 5 mph
Barometer 29.87 in (1011.2 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 19 Aug 7:54 pm CDT
Extended Forecast for

3 Miles WSW Greenfield IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly before 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. Northeast wind 3 to 5 mph.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. Light northeast wind.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly before 2am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 66. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. Northeast wind 3 to 5 mph.
Thursday Night
Mostly clear, with a low around 61. Light northeast wind.
Friday
Sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 64. Calm wind.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 83.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 65.
Wednesday
Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Greenfield IL
 39.33°N 90.26°W (Elev. 551 ft)
Last Update:
6:01 pm CDT Aug 19, 2026
Forecast Valid:
8pm CDT Aug 19, 2026-6pm CDT Aug 26, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation