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.

Fog/Mist

28°F

-2°C

Humidity 96%
Wind Speed Calm
Barometer 29.98 in (1015.5 mb)
Dewpoint 27°F (-3°C)
Visibility 4.00 mi
Last update 6 Dec 7:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Partly sunny, with a high near 41. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 41 °F

    Partly Sunny

  • Tonight

    Tonight: A 30 percent chance of rain, mainly between 10pm and 1am. Cloudy, with a low around 31. Southeast wind 6 to 8 mph.

    Low: 31 °F

    Chance Rain

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly cloudy, with a temperature falling to around 28 by 5pm. South wind 6 to 14 mph becoming north in the afternoon. Winds could gust as high as 21 mph.

    High: 38 °F⇓

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 14. North wind 6 to 10 mph.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 30. North wind around 6 mph becoming light and variable.

    High: 30 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 21.

    Low: 21 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain before noon. Partly sunny, with a high near 42.

    High: 42 °F

    Slight Chance
    Rain then
    Partly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 41. Calm wind becoming southeast around 6 mph in the afternoon.
Tonight
A 30 percent chance of rain, mainly between 10pm and 1am. Cloudy, with a low around 31. Southeast wind 6 to 8 mph.
Sunday
A 20 percent chance of rain before noon. Mostly cloudy, with a temperature falling to around 28 by 5pm. South wind 6 to 14 mph becoming north in the afternoon. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 14. North wind 6 to 10 mph.
Monday
Mostly sunny, with a high near 30. North wind around 6 mph becoming light and variable.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Mostly sunny, with a high near 47.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
A 20 percent chance of rain before noon. Partly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 35. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 19.
Friday
Partly sunny, with a high near 27.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
6:16 am CST Dec 6, 2025
Forecast Valid:
8am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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