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

40°F

4°C

Humidity 83%
Wind Speed Calm
Barometer 30.29 in (1025.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 6 Apr 1:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Overnight

    Overnight: Clear, with a low around 39. West wind 3 to 6 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 61. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain after 2am. Increasing clouds, with a low around 36. Northeast wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 36 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 52. East wind around 11 mph.

    High: 52 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. Southeast wind around 10 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Clear, with a low around 39. West wind 3 to 6 mph.
Monday
Sunny, with a high near 61. Northwest wind 8 to 13 mph, with gusts as high as 23 mph.
Monday Night
A 20 percent chance of rain after 2am. Increasing clouds, with a low around 36. Northeast wind 8 to 13 mph, with gusts as high as 22 mph.
Tuesday
Mostly cloudy, with a high near 52. East wind around 11 mph.
Tuesday Night
Mostly cloudy, with a low around 40. Southeast wind around 10 mph.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Chance of precipitation is 30%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 71. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 77.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
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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:
1:56 am CDT Apr 6, 2026
Forecast Valid:
2am CDT Apr 6, 2026-6pm CDT Apr 12, 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