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

36°F

2°C

Humidity 42%
Wind Speed SW 12 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 21 Jan 3:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: A chance of flurries before 5am. Cloudy, with a steady temperature around 36. Southwest wind around 11 mph.

    Low: 36 °F

    Chance
    Flurries

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 43. West wind 10 to 18 mph, with gusts as high as 30 mph.

    High: 43 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 21. Northwest wind 6 to 13 mph, with gusts as high as 24 mph.

    Low: 21 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 37. West wind 3 to 6 mph.

    High: 37 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 6. Light northwest wind becoming north 13 to 18 mph in the evening. Winds could gust as high as 25 mph.

    Low: 6 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 11.

    High: 11 °F

    Cold

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 0.

    Low: 0 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 50 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 12.

    High: 12 °F

    Slight Chance
    Snow then
    Chance Snow

  • Saturday Night

    Saturday Night: A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.

    Low: 7 °F

    Chance Snow
    then Slight
    Chance Snow

Detailed Forecast

Overnight
A chance of flurries before 5am. Cloudy, with a steady temperature around 36. Southwest wind around 11 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 43. West wind 10 to 18 mph, with gusts as high as 30 mph.
Wednesday Night
Mostly clear, with a low around 21. Northwest wind 6 to 13 mph, with gusts as high as 24 mph.
Thursday
Partly sunny, with a high near 37. West wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 6. Light northwest wind becoming north 13 to 18 mph in the evening. Winds could gust as high as 25 mph.
Friday
Mostly cloudy and cold, with a high near 11.
Friday Night
Mostly cloudy, with a low around 0.
Saturday
A 50 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 12.
Saturday Night
A 50 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 7.
Sunday
A 20 percent chance of snow before noon. Partly sunny and cold, with a high near 19.
Sunday Night
Partly cloudy, with a low around 3.
Monday
Sunny, with a high near 22.
Monday Night
Mostly clear, with a low around 9.
Tuesday
Mostly sunny, with a high near 34.
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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:
4:26 am CST Jan 21, 2026
Forecast Valid:
4am CST Jan 21, 2026-6pm CST Jan 27, 2026
 
Forecast Discussion
 
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Additional Resources

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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