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.

Fog/Mist

45°F

7°C

Humidity 90%
Wind Speed N 6 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 42°F (6°C)
Visibility 5.00 mi
Wind Chill42°F (6°C)
Last update 22 Nov 5:54 am CST
Extended Forecast for

3 Miles NNE Grafton IL

  • Today

    Today: Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 55. North wind 5 to 7 mph becoming light and variable.

    High: 55 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 40. West wind 5 to 7 mph.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Northwest wind around 6 mph becoming calm in the afternoon.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 42. Calm wind becoming southeast 5 to 7 mph after midnight.

    Low: 42 °F

    Increasing
    Clouds

  • Monday

    Monday: Showers likely, mainly after noon. Cloudy, with a high near 56. Southeast wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.

    High: 56 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Monday Night

    Monday Night: Showers, mainly before midnight. Low around 50. Chance of precipitation is 80%.

    Low: 50 °F

    Showers then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers after noon. Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 35.

    Low: 35 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

Detailed Forecast

Today
Patchy fog before 9am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 55. North wind 5 to 7 mph becoming light and variable.
Tonight
Mostly clear, with a low around 40. West wind 5 to 7 mph.
Sunday
Sunny, with a high near 58. Northwest wind around 6 mph becoming calm in the afternoon.
Sunday Night
Increasing clouds, with a low around 42. Calm wind becoming southeast 5 to 7 mph after midnight.
Monday
Showers likely, mainly after noon. Cloudy, with a high near 56. Southeast wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 70%.
Monday Night
Showers, mainly before midnight. Low around 50. Chance of precipitation is 80%.
Tuesday
A 20 percent chance of showers after noon. Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 35.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 29.
Thanksgiving Day
Mostly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 28.
Friday
Mostly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Grafton IL
 39.02°N 90.41°W (Elev. 614 ft)
Last Update:
4:21 am CST Nov 22, 2025
Forecast Valid:
6am CST Nov 22, 2025-6pm CST Nov 28, 2025
 
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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