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

64°F

18°C

Humidity 45%
Wind Speed NW 8 mph
Barometer 29.99 in (1015.0 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 13 May 3:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: Sunny, with a high near 73. Northwest wind 9 to 17 mph, with gusts as high as 24 mph.

    High: 73 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 47. North wind 5 to 10 mph becoming light northwest in the evening.

    Low: 47 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 56. Southeast wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    Low: 56 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 82. South wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 73. Northwest wind 9 to 17 mph, with gusts as high as 24 mph.
Tonight
Clear, with a low around 47. North wind 5 to 10 mph becoming light northwest in the evening.
Thursday
Sunny, with a high near 74. Calm wind becoming southeast 5 to 8 mph in the morning.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Increasing clouds, with a low around 56. Southeast wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 82. South wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 89.
Sunday Night
Partly cloudy, with a low around 69.
Monday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Monday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 79. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39.02°N 90.33°W (Elev. 650 ft)
Last Update:
2:01 am CDT May 13, 2026
Forecast Valid:
4am CDT May 13, 2026-6pm CDT May 19, 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