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.

Overcast

35°F

2°C

Humidity 78%
Wind Speed Calm
Barometer 30.12 in (1020.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 3 Dec 4:54 pm CST
Extended Forecast for

Dow IL

  • This Afternoon

    This Afternoon: A 50 percent chance of snow. Cloudy, with a high near 34. Light southwest wind.

    High: 34 °F

    Chance Snow

  • Tonight

    Tonight: Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 8. Light west wind becoming north 9 to 14 mph in the evening. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    Low: 8 °F

    Snow Likely
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny and cold, with a high near 20. North wind 5 to 9 mph becoming light northeast in the afternoon.

    High: 20 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 10. Light and variable wind becoming south around 6 mph in the evening.

    Low: 10 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 35. South wind 5 to 7 mph.

    High: 35 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 35.

    High: 35 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of freezing rain after midnight. Mostly cloudy, with a low around 23. Chance of precipitation is 20%.

    Low: 23 °F

    Mostly Cloudy
    then Slight
    Chance
    Freezing Rain

  • Sunday

    Sunday: A 20 percent chance of snow. Mostly cloudy, with a high near 30.

    High: 30 °F

    Slight Chance
    Snow

Detailed Forecast

This Afternoon
A 50 percent chance of snow. Cloudy, with a high near 34. Light southwest wind.
Tonight
Snow likely before 2am, then a chance of flurries between 2am and 3am. Cloudy, with a low around 8. Light west wind becoming north 9 to 14 mph in the evening. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday
Mostly cloudy, then gradually becoming sunny and cold, with a high near 20. North wind 5 to 9 mph becoming light northeast in the afternoon.
Thursday Night
Partly cloudy, with a low around 10. Light and variable wind becoming south around 6 mph in the evening.
Friday
Sunny, with a high near 35. South wind 5 to 7 mph.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Partly sunny, with a high near 35.
Saturday Night
A slight chance of freezing rain after midnight. Mostly cloudy, with a low around 23. Chance of precipitation is 20%.
Sunday
A 20 percent chance of snow. Mostly cloudy, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 14.
Monday
Mostly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 20 percent chance of rain. Partly sunny, with a high near 46.
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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:
4:56 pm CST Dec 3, 2025
Forecast Valid:
5pm CST Dec 3, 2025-6pm CST Dec 10, 2025
 
Forecast Discussion
 
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Additional Resources

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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