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

58°F

14°C

Humidity 65%
Wind Speed Calm
Barometer 29.90 in (1012.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 21 Mar 12:54 am CDT
Extended Forecast for

Kane ILSimilar City Names

  • Overnight

    Overnight: Mostly clear, with a low around 49. East wind 3 to 5 mph.

    Low: 49 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. East wind 5 to 8 mph becoming southwest in the afternoon.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 85. Breezy, with a southwest wind 10 to 15 mph becoming north 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 85 °F

    Mostly Sunny
    then Mostly
    Cloudy and
    Breezy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36. Breezy, with a north wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 32 mph.

    Low: 36 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Slight Chance
    Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 49. East wind 3 to 5 mph.
Saturday
Sunny, with a high near 88. East wind 5 to 8 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 63. South wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday
Increasing clouds, with a high near 85. Breezy, with a southwest wind 10 to 15 mph becoming north 16 to 21 mph in the afternoon. Winds could gust as high as 31 mph.
Sunday Night
Partly cloudy, with a low around 36. Breezy, with a north wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 32 mph.
Monday
Sunny, with a high near 56.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 62.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 42.
Wednesday
A slight chance of rain and thunderstorms. Mostly cloudy, with a high near 71. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 53.
Thursday
A 20 percent chance of rain. Sunny, with a high near 79.
Thursday Night
A 30 percent chance of rain. Partly cloudy, with a low around 42.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Kane ILSimilar City Names
 39.2°N 90.35°W (Elev. 551 ft)
Last Update:
1:26 am CDT Mar 21, 2026
Forecast Valid:
1am CDT Mar 21, 2026-6pm CDT Mar 27, 2026
 
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