National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

59°F

15°C

Humidity 63%
Wind Speed S 12 mph
Barometer 30.04 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 4 Nov 7:50 pm CST
Extended Forecast for

Chesterfield IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 50. South wind 10 to 15 mph, with gusts as high as 22 mph.

    Low: 50 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 66. Southwest wind 8 to 17 mph becoming north in the afternoon. Winds could gust as high as 26 mph.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 36. North wind 5 to 7 mph becoming east after midnight.

    Low: 36 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 62. Southeast wind 5 to 14 mph, with gusts as high as 23 mph.

    High: 62 °F

    Sunny

  • Thursday Night

    Thursday Night: A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 51. Southeast wind around 11 mph becoming southwest after midnight. Winds could gust as high as 21 mph.

    Low: 51 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers before noon. Mostly sunny, with a high near 69.

    High: 69 °F

    Chance
    Showers then
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance Rain
    then Mostly
    Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 50. South wind 10 to 15 mph, with gusts as high as 22 mph.
Wednesday
Sunny, with a high near 66. Southwest wind 8 to 17 mph becoming north in the afternoon. Winds could gust as high as 26 mph.
Wednesday Night
Mostly clear, with a low around 36. North wind 5 to 7 mph becoming east after midnight.
Thursday
Sunny, with a high near 62. Southeast wind 5 to 14 mph, with gusts as high as 23 mph.
Thursday Night
A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 51. Southeast wind around 11 mph becoming southwest after midnight. Winds could gust as high as 21 mph.
Friday
A 30 percent chance of showers before noon. Mostly sunny, with a high near 69.
Friday Night
Mostly clear, with a low around 39.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 63.
Saturday Night
A 30 percent chance of rain before midnight. Mostly cloudy, with a low around 35.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Partly cloudy, with a low around 23.
Monday
Sunny, with a high near 42.
Monday Night
Mostly clear, with a low around 23.
Veterans Day
Mostly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chesterfield IL
 39.26°N 90.06°W (Elev. 600 ft)
Last Update:
4:46 pm CST Nov 4, 2025
Forecast Valid:
8pm CST Nov 4, 2025-6pm CST Nov 11, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation