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.

Light Rain

69°F

21°C

Humidity 96%
Wind Speed Calm
Barometer 29.97 in (1014.4 mb)
Dewpoint 68°F (20°C)
Visibility 9.00 mi
Last update 14 Oct 6:54 am CDT
Extended Forecast for

West Alton MO

  • Today

    Today: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 79. Southwest wind around 7 mph becoming north in the afternoon. Chance of precipitation is 80%.

    High: 79 °F

    Showers then
    Chance
    Showers

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 65. North wind 5 to 7 mph becoming east after midnight. Chance of precipitation is 30%.

    Low: 65 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. Patchy fog between 10am and 11am. High near 83. East wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 83 °F

    Showers and
    Patchy Fog
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 47. West wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Showers

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy, with a northwest wind 21 to 23 mph, with gusts as high as 31 mph.

    High: 62 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 64.

    High: 64 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 79. Southwest wind around 7 mph becoming north in the afternoon. Chance of precipitation is 80%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 65. North wind 5 to 7 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Showers and thunderstorms, mainly before 2pm, then showers likely and possibly a thunderstorm after 5pm. Patchy fog between 10am and 11am. High near 83. East wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 47. West wind 9 to 17 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 62. Breezy, with a northwest wind 21 to 23 mph, with gusts as high as 31 mph.
Friday Night
Mostly clear, with a low around 38.
Saturday
Sunny, with a high near 64.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 44.
Monday
Partly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
West Alton MO
 38.89°N 90.25°W (Elev. 420 ft)
Last Update:
5:06 am CDT Oct 14, 2026
Forecast Valid:
7am CDT Oct 14, 2026-6pm CDT Oct 20, 2026
 
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