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

31°F

-1°C

Humidity 79%
Wind Speed Calm
Barometer 30.10 in (1019.4 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 12 Jan 9:54 pm CST
Extended Forecast for

5 Miles WNW Grafton IL

  • Tonight

    Tonight: Increasing clouds, with a low around 38. Calm wind becoming southwest 5 to 7 mph after midnight.

    Low: 38 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 58. West wind 8 to 13 mph, with gusts as high as 26 mph.

    High: 58 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 36. West wind 8 to 14 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 39 by 11am, then falling to around 32 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 34 mph.

    High: 39 °F⇓

    Mostly Cloudy
    then Partly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 18. North wind 10 to 17 mph, with gusts as high as 25 mph.

    Low: 18 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of snow after noon. Mostly cloudy, with a high near 40.

    High: 40 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 38. Calm wind becoming southwest 5 to 7 mph after midnight.
Tuesday
Increasing clouds, with a high near 58. West wind 8 to 13 mph, with gusts as high as 26 mph.
Tuesday Night
A 30 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 36. West wind 8 to 14 mph, with gusts as high as 22 mph.
Wednesday
Partly sunny, with a temperature rising to near 39 by 11am, then falling to around 32 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly clear, with a low around 18. North wind 10 to 17 mph, with gusts as high as 25 mph.
Thursday
Mostly sunny, with a high near 31.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
A 20 percent chance of snow after noon. Mostly cloudy, with a high near 40.
Friday Night
Mostly cloudy, with a low around 19.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Partly cloudy, with a low around 10.
Sunday
Mostly sunny, with a high near 24.
Sunday Night
Partly cloudy, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles WNW Grafton IL
 39°N 90.5°W (Elev. 801 ft)
Last Update:
9:41 pm CST Jan 12, 2026
Forecast Valid:
10pm CST Jan 12, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation