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

15°F

-9°C

Humidity 38%
Wind Speed W 5 mph
Barometer 30.41 in (1030.5 mb)
Dewpoint -6°F (-21°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 19 Jan 7:54 pm CST
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: Partly cloudy, with a low around 11. West wind around 6 mph becoming south after midnight.

    Low: 11 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36. South wind 5 to 11 mph.

    High: 36 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 30. South wind 10 to 15 mph, with gusts as high as 26 mph.

    Low: 30 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 42. West wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 42 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 22. Southwest wind 8 to 10 mph becoming northwest after midnight.

    Low: 22 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 9.

    Low: 9 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 15.

    High: 15 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 0.

    Low: 0 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 11. West wind around 6 mph becoming south after midnight.
Tuesday
Mostly sunny, with a high near 36. South wind 5 to 11 mph.
Tuesday Night
Increasing clouds, with a low around 30. South wind 10 to 15 mph, with gusts as high as 26 mph.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 42. West wind 9 to 14 mph, with gusts as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 22. Southwest wind 8 to 10 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 35.
Thursday Night
Mostly cloudy, with a low around 9.
Friday
Mostly cloudy and cold, with a high near 15.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 0.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 12.
Saturday Night
A 30 percent chance of snow. Partly cloudy, with a low around 3.
Sunday
Mostly sunny, with a high near 21.
Sunday Night
Mostly clear, with a low around 9.
Monday
Sunny, with a high near 33.
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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 pm CST Jan 19, 2026
Forecast Valid:
8pm CST Jan 19, 2026-6pm CST Jan 26, 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