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.

Overcast

41°F

5°C

Humidity 70%
Wind Speed NE 12 mph
Barometer 30.41 in (1029.9 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 7 Apr 6:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: A 20 percent chance of rain before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 54. East wind 10 to 14 mph.

    High: 54 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 39. East wind around 11 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72. Southeast wind 11 to 17 mph, with gusts as high as 26 mph.

    High: 72 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 53. South wind 10 to 14 mph.

    Low: 53 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers after 1pm. Sunny, with a high near 77. Southwest wind around 11 mph.

    High: 77 °F

    Sunny then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.

    High: 70 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 73.

    High: 73 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of rain before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 54. East wind 10 to 14 mph.
Tonight
Mostly cloudy, with a low around 39. East wind around 11 mph.
Wednesday
Partly sunny, with a high near 72. Southeast wind 11 to 17 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 53. South wind 10 to 14 mph.
Thursday
A 20 percent chance of showers after 1pm. Sunny, with a high near 77. Southwest wind around 11 mph.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 57.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 73.
Saturday Night
Mostly cloudy, with a low around 59.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 80.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82. Breezy.
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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 CDT Apr 7, 2026
Forecast Valid:
7am CDT Apr 7, 2026-6pm CDT Apr 13, 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