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

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fog/Mist

72°F

22°C

Humidity 97%
Wind Speed Calm
Barometer 29.86 in (1010.8 mb)
Dewpoint 71°F (22°C)
Visibility 5.00 mi
Last update 28 Jun 12:54 am CDT
Extended Forecast for

Winfield MO

Heat Advisory June 28, 12:00pm until July 3, 12:00am
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms and
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 95. Heat index values as high as 110. Light southeast wind becoming south 5 to 9 mph in the morning.

    High: 95 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 75. South wind 5 to 9 mph.

    Low: 75 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 96. Heat index values as high as 110. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 96 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. South wind 5 to 8 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 72. Calm wind.
Sunday
Patchy fog before 8am. Otherwise, sunny, with a high near 95. Heat index values as high as 110. Light southeast wind becoming south 5 to 9 mph in the morning.
Sunday Night
Increasing clouds, with a low around 75. South wind 5 to 9 mph.
Monday
Mostly sunny, with a high near 96. Heat index values as high as 110. South wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 76. South wind 5 to 8 mph.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 76.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Thursday Night
Partly cloudy, with a low around 75.
Friday
Sunny, with a high near 95.
Friday Night
Mostly clear, with a low around 75.
Independence Day
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winfield MO
 38.99°N 90.73°W (Elev. 433 ft)
Last Update:
12:46 am CDT Jun 28, 2026
Forecast Valid:
1am CDT Jun 28, 2026-6pm CDT Jul 4, 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