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.

Fog/Mist

68°F

20°C

Humidity 93%
Wind Speed Calm
Barometer 30.05 in (1017.1 mb)
Dewpoint 66°F (19°C)
Visibility 5.00 mi
Last update 15 Oct 2:54 am CDT
Extended Forecast for

3 Miles WNW Rockbridge IL

  • Overnight

    Overnight: A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 63. Light east wind.

    Low: 63 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 78. East wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 78 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 10pm, then scattered showers between 10pm and 1am. Increasing clouds, with a low around 42. Northwest wind 11 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 42 °F

    Showers
    Likely then
    Scattered
    Showers

  • Friday

    Friday: Isolated showers after 3pm. Increasing clouds, with a high near 56. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 56 °F

    Breezy.
    Mostly Sunny
    then Isolated
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 33. North wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 26 mph.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 33.

    Low: 33 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 35.

    Low: 35 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 63. Light east wind.
Thursday
Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 78. East wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and thunderstorms likely before 10pm, then scattered showers between 10pm and 1am. Increasing clouds, with a low around 42. Northwest wind 11 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Friday
Isolated showers after 3pm. Increasing clouds, with a high near 56. Breezy, with a northwest wind 16 to 21 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 33. North wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 26 mph.
Saturday
Sunny, with a high near 60.
Saturday Night
Clear, with a low around 33.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 35.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 37.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 41.
Wednesday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Rockbridge IL
 39.28°N 90.26°W (Elev. 505 ft)
Last Update:
1:26 am CDT Oct 15, 2026
Forecast Valid:
3am CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation