National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

36°F

2°C

Humidity 73%
Wind Speed W 8 mph
Barometer 30.32 in (1026.9 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 12 Mar 8:54 am CDT
Extended Forecast for

Grafton IL

Wind Advisory March 12, 10:00pm until March 13, 11:00am
Click here for hazard details and duration
Wind Advisory

  • Today

    Today: Sunny, with a high near 55. West wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 45. Breezy, with a south wind 13 to 20 mph, with gusts as high as 38 mph.

    Low: 45 °F

    Partly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 59. West wind 15 to 18 mph, with gusts as high as 30 mph.

    High: 59 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36. Northwest wind 5 to 8 mph becoming east after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 62. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.

    High: 62 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 66. Breezy. Chance of precipitation is 80%.

    High: 66 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: Rain and snow likely before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Blustery. Chance of precipitation is 60%.

    Low: 22 °F

    Rain/Snow
    Likely and
    Blustery

  • Monday

    Monday: Mostly sunny, with a high near 32. Breezy.

    High: 32 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Today
Sunny, with a high near 55. West wind 7 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph.
Tonight
Partly cloudy, with a low around 45. Breezy, with a south wind 13 to 20 mph, with gusts as high as 38 mph.
Friday
Partly sunny, with a high near 59. West wind 15 to 18 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 36. Northwest wind 5 to 8 mph becoming east after midnight.
Saturday
Partly sunny, with a high near 62. Southeast wind 7 to 11 mph, with gusts as high as 20 mph.
Saturday Night
A 20 percent chance of rain after 1am. Mostly cloudy, with a low around 53.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 66. Breezy. Chance of precipitation is 80%.
Sunday Night
Rain and snow likely before 1am, then a chance of snow. Mostly cloudy, with a low around 22. Blustery. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 32. Breezy.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 57.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grafton IL
 38.98°N 90.44°W (Elev. 515 ft)
Last Update:
5:56 am CDT Mar 12, 2026
Forecast Valid:
9am CDT Mar 12, 2026-6pm CDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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