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.

Fair

68°F

20°C

Humidity 32%
Wind Speed Vrbl 5 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 25 Mar 11:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 78. South wind 10 to 13 mph.

    High: 78 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 63. South wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 91 °F

    Sunny

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm before 1am, then showers and possibly a thunderstorm between 1am and 4am, then rain after 4am. Low around 42. Breezy, with a southwest wind 11 to 20 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 90%.

    Low: 42 °F

    Showers and
    Breezy

  • Friday

    Friday: Rain, mainly before 7am. High near 52. North wind 15 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.

    High: 52 °F

    Rain then
    Slight Chance
    Rain

  • Friday Night

    Friday Night: Mostly clear, with a low around 32.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 64.

    High: 64 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 78. South wind 10 to 13 mph.
Tonight
Mostly clear, with a low around 63. South wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday
Sunny, with a high near 91. Southwest wind 10 to 17 mph, with gusts as high as 26 mph.
Thursday Night
Rain likely and possibly a thunderstorm before 1am, then showers and possibly a thunderstorm between 1am and 4am, then rain after 4am. Low around 42. Breezy, with a southwest wind 11 to 20 mph becoming north after midnight. Winds could gust as high as 28 mph. Chance of precipitation is 90%.
Friday
Rain, mainly before 7am. High near 52. North wind 15 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Friday Night
Mostly clear, with a low around 32.
Saturday
Sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Partly sunny, with a high near 64.
Sunday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 53.
Monday
A 20 percent chance of rain and thunderstorms. Mostly sunny, with a high near 81.
Monday Night
A 30 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 60.
Tuesday
A 40 percent chance of rain and thunderstorms. Partly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
10:31 am CDT Mar 25, 2026
Forecast Valid:
12pm CDT Mar 25, 2026-6pm CDT Mar 31, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation