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

38°F

3°C

Humidity 37%
Wind Speed SW 7 mph
Barometer 30.10 in (1019.6 mb)
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 15 Dec 4:54 pm CST
Extended Forecast for

Hardin ILSimilar City Names

  • Tonight

    Tonight: Mostly clear, with a low around 27. Southwest wind around 7 mph.

    Low: 27 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 48. South wind 7 to 10 mph.

    High: 48 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32. South wind around 6 mph becoming calm after midnight.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature rising to around 50 by 5am. South wind 6 to 11 mph, with gusts as high as 22 mph.

    Low: 40 °F⇑

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers likely, mainly before noon. Partly sunny, with a temperature rising to near 55 by 8am, then falling to around 43 during the remainder of the day. Chance of precipitation is 70%.

    High: 55 °F⇓

    Showers
    Likely then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 27. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 48. South wind 7 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 32. South wind around 6 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 49. Calm wind becoming southeast around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature rising to around 50 by 5am. South wind 6 to 11 mph, with gusts as high as 22 mph.
Thursday
Showers likely, mainly before noon. Partly sunny, with a temperature rising to near 55 by 8am, then falling to around 43 during the remainder of the day. Chance of precipitation is 70%.
Thursday Night
Partly cloudy, with a low around 19.
Friday
Mostly sunny, with a high near 37.
Friday Night
Partly cloudy, with a low around 30.
Saturday
Partly sunny, with a high near 54.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Mostly sunny, with a high near 45.
Sunday Night
Mostly cloudy, with a low around 33.
Monday
Partly sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hardin ILSimilar City Names
 39.14°N 90.61°W (Elev. 427 ft)
Last Update:
4:51 pm CST Dec 15, 2025
Forecast Valid:
4pm CST Dec 15, 2025-6pm CST Dec 22, 2025
 
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Additional Resources

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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