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

57°F

14°C

Humidity 60%
Wind Speed Calm
Barometer 30.15 in (1020.9 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 20 Apr 9:54 pm CDT
Extended Forecast for

3 Miles WNW Carrollton IL

  • Tonight

    Tonight: Mostly clear, with a low around 50. Southeast wind 7 to 9 mph.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Southwest wind 9 to 18 mph, with gusts as high as 30 mph.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly clear, with a low around 55. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 55 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. Southwest wind around 9 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind 6 to 8 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.

    Low: 59 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 74. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 49. Chance of precipitation is 50%.

    Low: 49 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 50. Southeast wind 7 to 9 mph.
Tuesday
Sunny, with a high near 78. Southwest wind 9 to 18 mph, with gusts as high as 30 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly clear, with a low around 55. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Mostly sunny, with a high near 77. Southwest wind around 9 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind 6 to 8 mph.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.
Friday
Showers and possibly a thunderstorm. High near 74. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 49. Chance of precipitation is 50%.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 70.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 48.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 70.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 51.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 68.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Carrollton IL
 39.29°N 90.46°W (Elev. 607 ft)
Last Update:
9:56 pm CDT Apr 20, 2026
Forecast Valid:
10pm CDT Apr 20, 2026-6pm CDT Apr 27, 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