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

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Partly Cloudy

79°F

26°C

Humidity 69%
Wind Speed SW 6 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 5 Jul 2:54 pm CDT
Extended Forecast for

3 Miles WNW Winfield MO

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Northwest wind 3 to 5 mph.

    High: 86 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Partly cloudy, with a low around 67. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 85. Northeast wind 3 to 6 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 86. Light north wind.

    High: 86 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 66.

    Low: 66 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Northwest wind 3 to 5 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Partly cloudy, with a low around 67. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 85. Northeast wind 3 to 6 mph.
Monday Night
Partly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 86. Light north wind.
Tuesday Night
Clear, with a low around 66.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 71.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 72. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 87.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Winfield MO
 39.01°N 90.81°W (Elev. 600 ft)
Last Update:
2:31 pm CDT Jul 5, 2026
Forecast Valid:
3pm CDT Jul 5, 2026-6pm CDT Jul 12, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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