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.

Fair

28°F

-2°C

Humidity 66%
Wind Speed S 6 mph
Barometer 30.37 in (1028.7 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 12 Jan 1:54 am CST
Extended Forecast for

3 Miles WSW Greenfield IL

  • Overnight

    Overnight: Clear, with a low around 23. South wind 6 to 8 mph.

    Low: 23 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 50. Southwest wind 7 to 10 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 56. West wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 56 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 9 to 13 mph, with gusts as high as 20 mph.

    Low: 35 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain and snow showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 32 by 5pm. Breezy. Chance of precipitation is 20%.

    High: 41 °F⇓

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 24.

    Low: 24 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Clear, with a low around 23. South wind 6 to 8 mph.
Monday
Sunny, with a high near 50. Southwest wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.
Tuesday
Increasing clouds, with a high near 56. West wind 9 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 9 to 13 mph, with gusts as high as 20 mph.
Wednesday
A slight chance of rain and snow showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 32 by 5pm. Breezy. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 16.
Thursday
Mostly sunny, with a high near 29.
Thursday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 24.
Friday
A 30 percent chance of snow showers after noon. Partly sunny, with a high near 39. Breezy.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Partly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 25.
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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:
2:41 am CST Jan 12, 2026
Forecast Valid:
2am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation