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

56°F

13°C

Humidity 30%
Wind Speed SW 8 mph
Barometer 30.15 in (1021.3 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Last update 12 Jan 3:54 pm CST
Extended Forecast for

5 Miles NNW Hazelwood MO

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 37. Southwest wind 6 to 8 mph, with gusts as high as 20 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Increasing clouds, with a high near 61. West wind 9 to 14 mph, with gusts as high as 26 mph.

    High: 61 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 36. West wind 8 to 14 mph, with gusts as high as 23 mph.

    Low: 36 °F

    Chance Rain
    then Mostly
    Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a temperature rising to near 41 by 11am, then falling to around 33 during the remainder of the day. Breezy, with a northwest wind 14 to 23 mph, with gusts as high as 34 mph.

    High: 41 °F⇓

    Partly Sunny
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 17. North wind 9 to 16 mph, with gusts as high as 24 mph.

    Low: 17 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of rain and snow after noon. Mostly cloudy, with a high near 43. Breezy. Chance of precipitation is 20%.

    High: 43 °F

    Partly Sunny
    then Slight
    Chance
    Rain/Snow and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 37. Southwest wind 6 to 8 mph, with gusts as high as 20 mph.
Tuesday
Increasing clouds, with a high near 61. West wind 9 to 14 mph, with gusts as high as 26 mph.
Tuesday Night
A 30 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 36. West wind 8 to 14 mph, with gusts as high as 23 mph.
Wednesday
Partly sunny, with a temperature rising to near 41 by 11am, then falling to around 33 during the remainder of the day. Breezy, with a northwest wind 14 to 23 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly clear, with a low around 17. North wind 9 to 16 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 32.
Thursday Night
Mostly cloudy, with a low around 25.
Friday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 43. Breezy. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
Mostly cloudy, with a high near 28.
Saturday Night
Partly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 26.
Sunday Night
Partly cloudy, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNW Hazelwood MO
 38.85°N 90.39°W (Elev. 430 ft)
Last Update:
4:46 pm CST Jan 12, 2026
Forecast Valid:
4pm CST Jan 12, 2026-6pm CST Jan 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