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.

Rain Fog/Mist

75°F

24°C

Humidity 90%
Wind Speed N 6 mph
Barometer 29.91 in (1012.3 mb)
Dewpoint 72°F (22°C)
Visibility 5.00 mi
Last update 15 Jul 5:54 pm CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 72. Southeast wind around 6 mph becoming light and variable in the evening.

    Low: 72 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93. Heat index values as high as 102. Light southwest wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 30%.

    High: 93 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 75. Southwest wind around 7 mph.

    Low: 75 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86. West wind 6 to 9 mph.

    High: 86 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Northeast wind 5 to 7 mph.

    Low: 70 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.

    High: 83 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 72. Southeast wind around 6 mph becoming light and variable in the evening.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 93. Heat index values as high as 102. Light southwest wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 30%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 75. Southwest wind around 7 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86. West wind 6 to 9 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Northeast wind 5 to 7 mph.
Friday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Tuesday
Mostly sunny, with a high near 94.
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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:
4:21 pm CDT Jul 15, 2025
Forecast Valid:
6pm CDT Jul 15, 2025-6pm CDT Jul 22, 2025
 
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