National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Mostly Cloudy

74°F

23°C

Humidity 62%
Wind Speed S 14 mph
Barometer 29.90 in (1012.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 3 Apr 10:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 52. Southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 52 °F

    Showers

  • Saturday

    Saturday: Showers, mainly before 9am. Temperature falling to around 52 by noon. West wind 11 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.

    High: 61 °F⇓

    Showers then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. West wind 10 to 16 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 58. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 40. West wind around 7 mph.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 52. Southwest wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Saturday
Showers, mainly before 9am. Temperature falling to around 52 by noon. West wind 11 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Saturday Night
Partly cloudy, with a low around 38. West wind 10 to 16 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 58. Northwest wind 10 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Clear, with a low around 40. West wind around 7 mph.
Monday
Sunny, with a high near 60.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 36.
Tuesday
Mostly cloudy, with a high near 54.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 74.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
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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:
10:26 pm CDT Apr 3, 2026
Forecast Valid:
11pm CDT Apr 3, 2026-6pm CDT Apr 10, 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