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.

Mostly Cloudy

33°F

1°C

Humidity 56%
Wind Speed SE 12 mph
Barometer 30.09 in (1019.2 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 18 Mar 12:54 am CDT
Extended Forecast for

4 Miles SSW Hardin IL

  • Overnight

    Overnight: A chance of flurries before 4am. Cloudy, with a low around 29. South wind 7 to 11 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Chance
    Flurries

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 62. South wind 6 to 9 mph becoming west in the afternoon.

    High: 62 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 44. Calm wind becoming south around 6 mph after midnight.

    Low: 44 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 70. South wind around 6 mph becoming northwest in the afternoon.

    High: 70 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 42. North wind 3 to 6 mph.

    Low: 42 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

Detailed Forecast

Overnight
A chance of flurries before 4am. Cloudy, with a low around 29. South wind 7 to 11 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 62. South wind 6 to 9 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 44. Calm wind becoming south around 6 mph after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 70. South wind around 6 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 42. North wind 3 to 6 mph.
Friday
Mostly sunny, with a high near 72.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 55.
Sunday
Mostly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly sunny, with a high near 53.
Monday Night
Mostly cloudy, with a low around 36.
Tuesday
Mostly sunny, with a high near 56.
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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:
1:06 am CDT Mar 18, 2026
Forecast Valid:
1am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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