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

47°F

8°C

Humidity 66%
Wind Speed Calm
Barometer 30.31 in (1026.4 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 5 Apr 9:54 pm CDT
Extended Forecast for

4 Miles NE Grafton IL

  • Tonight

    Tonight: Clear, with a low around 41. West wind around 6 mph.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 59. Northwest wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 59 °F

    Sunny

  • Monday Night

    Monday Night: A chance of rain showers after 1am, mixing with snow after 4am. Increasing clouds, with a low around 37. Northeast wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

    Low: 37 °F

    Partly Cloudy
    then Chance
    Rain/Snow

  • Tuesday

    Tuesday: A 30 percent chance of snow showers before 7am. Mostly cloudy, with a high near 52. East wind around 11 mph.

    High: 52 °F

    Chance Snow
    Showers then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. East wind around 10 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 72.

    High: 72 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 41. West wind around 6 mph.
Monday
Sunny, with a high near 59. Northwest wind 8 to 13 mph, with gusts as high as 22 mph.
Monday Night
A chance of rain showers after 1am, mixing with snow after 4am. Increasing clouds, with a low around 37. Northeast wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of snow showers before 7am. Mostly cloudy, with a high near 52. East wind around 11 mph.
Tuesday Night
Mostly cloudy, with a low around 41. East wind around 10 mph.
Wednesday
Mostly sunny, with a high near 72.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 30%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NE Grafton IL
 39°N 90.39°W (Elev. 640 ft)
Last Update:
9:46 pm CDT Apr 5, 2026
Forecast Valid:
10pm CDT Apr 5, 2026-6pm CDT Apr 12, 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