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

43°F

6°C

Humidity 82%
Wind Speed E 8 mph
Barometer 29.96 in (1014.6 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 16 Feb 10:54 pm CST
Extended Forecast for

4 Miles WSW Hardin IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 42. South wind around 6 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 66. South wind 5 to 14 mph, with gusts as high as 28 mph.

    High: 66 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms between 2am and 5am. Cloudy during the early evening, then gradual clearing, with a low around 54. Southwest wind 13 to 16 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 54 °F

    Cloudy then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 70. West wind 6 to 10 mph, with gusts as high as 23 mph.

    High: 70 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45. Calm wind becoming southeast around 5 mph after midnight.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers. Mostly sunny, with a high near 71.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 35.

    Low: 35 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 42. South wind around 6 mph.
Tuesday
Cloudy, with a high near 66. South wind 5 to 14 mph, with gusts as high as 28 mph.
Tuesday Night
A slight chance of showers and thunderstorms between 2am and 5am. Cloudy during the early evening, then gradual clearing, with a low around 54. Southwest wind 13 to 16 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 70. West wind 6 to 10 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 45. Calm wind becoming southeast around 5 mph after midnight.
Thursday
A 40 percent chance of showers. Mostly sunny, with a high near 71.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 35.
Friday
Mostly sunny, with a high near 49.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Mostly sunny, with a high near 48.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 26.
Sunday
Sunny, with a high near 41.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Mostly sunny, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Hardin IL
 39.14°N 90.69°W (Elev. 430 ft)
Last Update:
8:42 pm CST Feb 16, 2026
Forecast Valid:
11pm CST Feb 16, 2026-6pm CST Feb 23, 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