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

31°F

-1°C

Humidity 76%
Wind Speed E 3 mph
Barometer 30.07 in (1018.5 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 17 Nov 4:54 am CST
Extended Forecast for

2 Miles NNE Grafton IL

  • Today

    Today: A 20 percent chance of showers after 4pm. Increasing clouds, with a high near 57. Southeast wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 57 °F

    Sunny then
    Slight Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before 3am, then a chance of showers. Mostly cloudy, with a low around 49. Southeast wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A 20 percent chance of showers. Partly sunny, with a high near 71. Southeast wind 8 to 10 mph becoming northwest in the afternoon.

    High: 71 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 45. North wind 5 to 7 mph.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 59. Northeast wind around 5 mph becoming calm in the morning.

    High: 59 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday

    Thursday: Rain, with thunderstorms also possible after noon. High near 64. Chance of precipitation is 90%.

    High: 64 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm. Cloudy, with a low around 53. Chance of precipitation is 70%.

    Low: 53 °F

    Rain Likely

  • Friday

    Friday: Rain likely, mainly before noon. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.

    High: 62 °F

    Rain Likely

Detailed Forecast

Today
A 20 percent chance of showers after 4pm. Increasing clouds, with a high near 57. Southeast wind 6 to 13 mph, with gusts as high as 22 mph.
Tonight
Showers and thunderstorms likely before 3am, then a chance of showers. Mostly cloudy, with a low around 49. Southeast wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 71. Southeast wind 8 to 10 mph becoming northwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 45. North wind 5 to 7 mph.
Wednesday
Mostly cloudy, with a high near 59. Northeast wind around 5 mph becoming calm in the morning.
Wednesday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 48.
Thursday
Rain, with thunderstorms also possible after noon. High near 64. Chance of precipitation is 90%.
Thursday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 53. Chance of precipitation is 70%.
Friday
Rain likely, mainly before noon. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 43.
Saturday
Partly sunny, with a high near 54.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Mostly sunny, with a high near 57.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNE Grafton IL
 39°N 90.41°W (Elev. 682 ft)
Last Update:
3:16 am CST Nov 17, 2025
Forecast Valid:
5am CST Nov 17, 2025-6pm CST Nov 23, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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