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

26°F

-3°C

Humidity 66%
Wind Speed E 8 mph
Barometer 30.20 in (1022.9 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 8 Feb 5:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Mostly sunny, with a high near 45. Southeast wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 45 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 28. East wind 5 to 9 mph.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 51. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 51 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Southeast wind 7 to 9 mph becoming west after midnight.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 57. West wind 6 to 9 mph becoming north in the morning.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of rain, mainly after noon. Mostly cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 45. Southeast wind 10 to 14 mph, with gusts as high as 22 mph.
Tonight
Partly cloudy, with a low around 28. East wind 5 to 9 mph.
Monday
Mostly sunny, with a high near 51. Light and variable wind becoming south 5 to 7 mph in the morning.
Monday Night
Mostly clear, with a low around 39. Southeast wind 7 to 9 mph becoming west after midnight.
Tuesday
Mostly sunny, with a high near 57. West wind 6 to 9 mph becoming north in the morning.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 49.
Wednesday Night
Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain, mainly after noon. Mostly cloudy, with a high near 45.
Thursday Night
A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 31.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 47.
Friday Night
A 30 percent chance of rain. Partly cloudy, with a low around 31.
Saturday
A 40 percent chance of rain. Mostly sunny, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
5:21 am CST Feb 8, 2026
Forecast Valid:
6am CST Feb 8, 2026-6pm CST Feb 14, 2026
 
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