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

41°F

5°C

Humidity 39%
Wind Speed W 8 mph
Barometer 30.22 in (1023.7 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 21 Feb 3:54 pm CST
Extended Forecast for

4 Miles E Dow IL

  • Tonight

    Tonight: Mostly clear, with a low around 20. Northwest wind 10 to 17 mph, with gusts as high as 26 mph.

    Low: 20 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 31. Blustery, with a northwest wind 17 to 22 mph, with gusts as high as 32 mph.

    High: 31 °F

    Mostly Sunny
    and Blustery

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 14. Northwest wind 15 to 18 mph, with gusts as high as 29 mph.

    Low: 14 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 33. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 33 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 19. Calm wind becoming south 5 to 7 mph after midnight.

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 56.

    High: 56 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 20. Northwest wind 10 to 17 mph, with gusts as high as 26 mph.
Sunday
Mostly sunny, with a high near 31. Blustery, with a northwest wind 17 to 22 mph, with gusts as high as 32 mph.
Sunday Night
Partly cloudy, with a low around 14. Northwest wind 15 to 18 mph, with gusts as high as 29 mph.
Monday
Sunny, with a high near 33. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Monday Night
Partly cloudy, with a low around 19. Calm wind becoming south 5 to 7 mph after midnight.
Tuesday
Partly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 56.
Wednesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Mostly sunny, with a high near 49.
Thursday Night
Mostly clear, with a low around 28.
Friday
Sunny, with a high near 59.
Friday Night
Mostly clear, with a low around 37.
Saturday
Mostly sunny, with a high near 60.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Dow IL
 39.04°N 90.24°W (Elev. 600 ft)
Last Update:
12:26 pm CST Feb 21, 2026
Forecast Valid:
4pm CST Feb 21, 2026-6pm CST Feb 28, 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