National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

30°F

-1°C

Humidity 58%
Wind Speed Calm
Barometer 30.51 in (1033.4 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 28 Nov 9:54 am CST
Extended Forecast for

Dow IL

Winter Weather Advisory November 29, 12:00am until November 30, 12:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Today

    Today: Increasing clouds, with a high near 36. Northwest wind around 5 mph becoming calm.

    High: 36 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Snow, mainly after 3am. The snow could be heavy at times. Low around 30. Southeast wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 30 °F

    Slight Chance
    Snow then
    Heavy Snow

  • Saturday

    Saturday: Rain and snow, possibly mixed with sleet before noon, then rain, possibly mixed with snow between noon and 3pm, then rain after 3pm. High near 36. Breezy, with a southeast wind 16 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.

    High: 36 °F

    Wintry Mix
    and Breezy

  • Saturday Night

    Saturday Night: Rain and snow likely, mainly before midnight. Cloudy, with a low around 23. Breezy, with a south wind 14 to 20 mph becoming northwest after midnight. Chance of precipitation is 70%. Little or no snow accumulation expected.

    Low: 23 °F

    Rain/Snow
    Likely then
    Cloudy and
    Breezy

  • Sunday

    Sunday: Mostly cloudy, with a high near 28. Northwest wind 10 to 18 mph, with gusts as high as 25 mph.

    High: 28 °F

    Mostly Cloudy

  • Sunday Night

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

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of snow after noon. Mostly cloudy, with a high near 25.

    High: 25 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Monday Night

    Monday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 17.

    Low: 17 °F

    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 36. Northwest wind around 5 mph becoming calm.
Tonight
Snow, mainly after 3am. The snow could be heavy at times. Low around 30. Southeast wind 6 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Saturday
Rain and snow, possibly mixed with sleet before noon, then rain, possibly mixed with snow between noon and 3pm, then rain after 3pm. High near 36. Breezy, with a southeast wind 16 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 2 to 4 inches possible.
Saturday Night
Rain and snow likely, mainly before midnight. Cloudy, with a low around 23. Breezy, with a south wind 14 to 20 mph becoming northwest after midnight. Chance of precipitation is 70%. Little or no snow accumulation expected.
Sunday
Mostly cloudy, with a high near 28. Northwest wind 10 to 18 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 14.
Monday
A 20 percent chance of snow after noon. Mostly cloudy, with a high near 25.
Monday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 17.
Tuesday
Partly sunny, with a high near 29.
Tuesday Night
Partly cloudy, with a low around 18.
Wednesday
Partly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 20.
Thursday
Partly sunny, with a high near 30.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
8:01 am CST Nov 28, 2025
Forecast Valid:
10am CST Nov 28, 2025-6pm CST Dec 4, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation