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

43°F

6°C

Humidity 80%
Wind Speed SW 3 mph
Barometer 30.30 in (1026.1 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 6 Apr 12:54 am CDT
Extended Forecast for

5 Miles W Dow IL

  • Overnight

    Overnight: Clear, with a low around 39. Calm wind becoming west around 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 22 mph.

    High: 61 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain after 2am. Increasing clouds, with a low around 35. Northeast wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 35 °F

    Partly Cloudy
    then Slight
    Chance Rain

  • Tuesday

    Tuesday: A chance of rain and snow before 7am. Mostly cloudy, with a high near 52. East wind around 11 mph. Chance of precipitation is 30%.

    High: 52 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. East wind around 10 mph, with gusts as high as 20 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly 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. Calm wind becoming west around 6 mph.
Monday
Sunny, with a high near 61. Northwest wind 8 to 13 mph, with gusts as high as 22 mph.
Monday Night
A 20 percent chance of rain after 2am. Increasing clouds, with a low around 35. Northeast wind 8 to 13 mph, with gusts as high as 21 mph.
Tuesday
A chance of rain and snow before 7am. Mostly cloudy, with a high near 52. East wind around 11 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 40. East wind around 10 mph, with gusts as high as 20 mph.
Wednesday
Mostly 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 78.
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:
5 Miles W Dow IL
 39.05°N 90.41°W (Elev. 600 ft)
Last Update:
1:26 am CDT Apr 6, 2026
Forecast Valid:
1am 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