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

58°F

14°C

Humidity 62%
Wind Speed N 3 mph
Barometer 30.05 in (1017.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 13 May 9:54 pm CDT
Extended Forecast for

2 Miles S Dow IL

  • Tonight

    Tonight: Clear, with a low around 45. North wind around 5 mph becoming calm in the evening.

    Low: 45 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74. Calm wind becoming southeast 5 to 9 mph in the morning.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 54. Southeast wind 10 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63. South wind 8 to 13 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 45. North wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 74. Calm wind becoming southeast 5 to 9 mph in the morning.
Thursday Night
A chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 54. Southeast wind 10 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Friday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63. South wind 8 to 13 mph, with gusts as high as 20 mph.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
Mostly clear, with a low around 69.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Breezy.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Dow IL
 39.02°N 90.3°W (Elev. 610 ft)
Last Update:
9:36 pm CDT May 13, 2026
Forecast Valid:
10pm CDT May 13, 2026-6pm CDT May 20, 2026
 
Forecast Discussion
 
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Additional Resources

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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