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

50°F

10°C

Humidity 61%
Wind Speed W 7 mph
Barometer 29.85 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 6 Jan 8:54 pm CST
Extended Forecast for

4 Miles SSW Hardin IL

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly clear, with a low around 31. Northwest wind around 5 mph becoming calm after midnight.

    Low: 31 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 10am. Otherwise, sunny, with a high near 59. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 59 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 45. South wind around 8 mph.

    Low: 45 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain. High near 60. Southeast wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

    High: 60 °F

    Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 47. South wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 21 mph.

    Low: 47 °F

    Chance Rain
    then Slight
    Chance Rain

  • Friday

    Friday: Mostly cloudy, with a high near 51.

    High: 51 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

  • Saturday

    Saturday: A slight chance of rain before noon, then a slight chance of rain and snow. Partly sunny, with a high near 43. Chance of precipitation is 20%.

    High: 43 °F

    Slight Chance
    Rain then
    Slight Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly clear, with a low around 31. Northwest wind around 5 mph becoming calm after midnight.
Wednesday
Patchy fog before 10am. Otherwise, sunny, with a high near 59. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
Increasing clouds, with a low around 45. South wind around 8 mph.
Thursday
Rain. High near 60. Southeast wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Thursday Night
A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 47. South wind 8 to 11 mph becoming west after midnight. Winds could gust as high as 21 mph.
Friday
Mostly cloudy, with a high near 51.
Friday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.
Saturday
A slight chance of rain before noon, then a slight chance of rain and snow. Partly sunny, with a high near 43. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 35.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 47.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Mostly sunny, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW Hardin IL
 39.1°N 90.64°W (Elev. 758 ft)
Last Update:
5:21 pm CST Jan 6, 2026
Forecast Valid:
9pm CST Jan 6, 2026-6pm CST Jan 13, 2026
 
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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