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 24%
Wind Speed N 10 mph
Barometer 29.97 in (1014.9 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Last update 13 Mar 5:54 pm CDT
Extended Forecast for

2 Miles ESE Hardin IL

  • Tonight

    Tonight: Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light and variable.

    Low: 35 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 62. Southeast wind 6 to 13 mph, with gusts as high as 23 mph.

    High: 62 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. Southeast wind 10 to 13 mph, with gusts as high as 24 mph.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. Breezy, with a south wind 15 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 90%.

    High: 69 °F

    Chance Rain
    then Showers
    and Breezy

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow. Some thunder is also possible. Low around 20. Blustery, with a west wind 20 to 24 mph, with gusts as high as 46 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Low: 20 °F

    Rain/Snow and
    Breezy then
    Snow and
    Blustery

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.

    High: 28 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 11.

    Low: 11 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 36.

    High: 36 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Low: 28 °F

    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 35. Northwest wind 5 to 9 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 62. Southeast wind 6 to 13 mph, with gusts as high as 23 mph.
Saturday Night
Partly cloudy, with a low around 54. Southeast wind 10 to 13 mph, with gusts as high as 24 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 69. Breezy, with a south wind 15 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow. Some thunder is also possible. Low around 20. Blustery, with a west wind 20 to 24 mph, with gusts as high as 46 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 28. Blustery.
Monday Night
Mostly clear, with a low around 11.
Tuesday
Mostly sunny, with a high near 36.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Wednesday
Mostly sunny, with a high near 64.
Wednesday Night
Mostly clear, with a low around 38.
Thursday
Mostly sunny, with a high near 69.
Thursday Night
Mostly clear, with a low around 43.
Friday
Sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Hardin IL
 39.14°N 90.58°W (Elev. 430 ft)
Last Update:
6:16 pm CDT Mar 13, 2026
Forecast Valid:
6pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation