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

20°F

-7°C

Humidity 57%
Wind Speed NW 9 mph
Barometer 30.13 in (1020.5 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill10°F (-12°C)
Last update 15 Jan 2:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Clear, with a low around 16. Northwest wind around 8 mph.

    Low: 16 °F

    Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 34. Northwest wind 6 to 8 mph becoming south in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Snow likely before midnight, then scattered flurries after 5am. Mostly cloudy, with a low around 29. South wind 8 to 11 mph becoming west after midnight. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 29 °F

    Snow Likely
    then Mostly
    Cloudy

  • Friday

    Friday: Partly sunny, with a high near 43. West wind 13 to 17 mph, with gusts as high as 26 mph.

    High: 43 °F

    Partly Sunny

  • Friday Night

    Friday Night: Scattered snow showers. Mostly cloudy, with a low around 20. West wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    Low: 20 °F

    Scattered
    Snow Showers

  • Saturday

    Saturday: Partly sunny, with a high near 24.

    High: 24 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 11.

    Low: 11 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 16. Northwest wind around 8 mph.
Thursday
Increasing clouds, with a high near 34. Northwest wind 6 to 8 mph becoming south in the afternoon.
Thursday Night
Snow likely before midnight, then scattered flurries after 5am. Mostly cloudy, with a low around 29. South wind 8 to 11 mph becoming west after midnight. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Friday
Partly sunny, with a high near 43. West wind 13 to 17 mph, with gusts as high as 26 mph.
Friday Night
Scattered snow showers. Mostly cloudy, with a low around 20. West wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Saturday
Partly sunny, with a high near 24.
Saturday Night
Mostly clear, with a low around 11.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Partly cloudy, with a low around 14.
M.L.King Day
Sunny, with a high near 23.
Monday Night
Mostly clear, with a low around 9.
Tuesday
Sunny, with a high near 29.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
Mostly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
3:16 am CST Jan 15, 2026
Forecast Valid:
3am CST Jan 15, 2026-6pm CST Jan 21, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation