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.

Partly Cloudy

73°F

23°C

Humidity 43%
Wind Speed SW 8 mph
Barometer 29.95 in (1013.7 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 12 May 9:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, then gradually becoming clear, with a low around 57. West wind 8 to 10 mph becoming north after midnight.

    Low: 57 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 73. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 47. North wind 5 to 9 mph becoming calm in the evening.

    Low: 47 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74. Light southeast wind increasing to 5 to 10 mph in the morning.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 55. Southeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 55 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.

    High: 87 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, then gradually becoming clear, with a low around 57. West wind 8 to 10 mph becoming north after midnight.
Wednesday
Sunny, with a high near 73. Northwest wind 10 to 15 mph, with gusts as high as 23 mph.
Wednesday Night
Clear, with a low around 47. North wind 5 to 9 mph becoming calm in the evening.
Thursday
Sunny, with a high near 74. Light southeast wind increasing to 5 to 10 mph in the morning.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 55. Southeast wind 13 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 64.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 89. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
9:21 pm CDT May 12, 2026
Forecast Valid:
10pm CDT May 12, 2026-6pm CDT May 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation