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.

Overcast

23°F

-5°C

Humidity 74%
Wind Speed Calm
Barometer 30.50 in (1033.4 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 1 Dec 12:54 am CST
Extended Forecast for

Dow IL

  • Overnight

    Overnight: Cloudy, with a low around 18. East wind 3 to 5 mph.

    Low: 18 °F

    Cloudy

  • Monday

    Monday: Snow likely, mainly after 5pm. Cloudy, with a high near 29. East wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    High: 29 °F

    Cloudy then
    Snow Likely

  • Monday Night

    Monday Night: Snow, mainly before 1am. Low around 18. Calm wind becoming northwest around 6 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 18 °F

    Snow then
    Chance Snow

  • Tuesday

    Tuesday: Mostly sunny, with a high near 29. Northwest wind around 6 mph becoming south in the afternoon.

    High: 29 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 19. South wind 5 to 7 mph.

    Low: 19 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 36.

    High: 36 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny and cold, with a high near 19.

    High: 19 °F

    Cold

  • Thursday Night

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

    Low: 9 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Cloudy, with a low around 18. East wind 3 to 5 mph.
Monday
Snow likely, mainly after 5pm. Cloudy, with a high near 29. East wind around 6 mph becoming calm in the afternoon. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Monday Night
Snow, mainly before 1am. Low around 18. Calm wind becoming northwest around 6 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Tuesday
Mostly sunny, with a high near 29. Northwest wind around 6 mph becoming south in the afternoon.
Tuesday Night
Partly cloudy, with a low around 19. South wind 5 to 7 mph.
Wednesday
Partly sunny, with a high near 36.
Wednesday Night
Mostly cloudy, with a low around 11.
Thursday
Mostly sunny and cold, with a high near 19.
Thursday Night
Mostly cloudy, with a low around 9.
Friday
A 40 percent chance of snow. Mostly cloudy, with a high near 31.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 23.
Saturday
Mostly cloudy, with a high near 35.
Saturday Night
Mostly cloudy, with a low around 24.
Sunday
A 20 percent chance of snow. Mostly cloudy, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dow IL
 39.04°N 90.33°W (Elev. 623 ft)
Last Update:
10:31 pm CST Nov 30, 2025
Forecast Valid:
1am CST Dec 1, 2025-6pm CST Dec 7, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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