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

27°F

-3°C

Humidity 66%
Wind Speed E 9 mph
Barometer 30.26 in (1025.0 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 8 Feb 12:54 am CST
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Partly cloudy, with a low around 26. Southeast wind 9 to 13 mph, with gusts as high as 22 mph.

    Low: 26 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 44. Southeast wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 44 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 28. East wind 5 to 9 mph becoming light after midnight.

    Low: 28 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 54. Light and variable wind becoming south around 6 mph in the morning.

    High: 54 °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.

    High: 57 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 33 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • 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

Detailed Forecast

Overnight
Partly cloudy, with a low around 26. Southeast wind 9 to 13 mph, with gusts as high as 22 mph.
Sunday
Mostly sunny, with a high near 44. Southeast wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Partly cloudy, with a low around 28. East wind 5 to 9 mph becoming light after midnight.
Monday
Mostly sunny, with a high near 54. Light and variable wind becoming south around 6 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.
Tuesday Night
A 20 percent chance of rain before midnight. 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. 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:
1:01 am CST Feb 8, 2026
Forecast Valid:
1am CST Feb 8, 2026-6pm CST Feb 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation