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

39°F

4°C

Humidity 63%
Wind Speed S 9 mph
Barometer 30.07 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 12 Jan 11:55 pm CST
Extended Forecast for

Chesterfield IL

  • Overnight

    Overnight: Partly cloudy, with a low around 35. South wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 35 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Increasing clouds, with a high near 57. West wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 57 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of rain between 7pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 33. West wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 33 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature rising to near 38 by 11am, then falling to around 30 during the remainder of the day. Breezy, with a northwest wind 16 to 24 mph, with gusts as high as 34 mph.

    High: 38 °F⇓

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 15. North wind 9 to 17 mph, with gusts as high as 26 mph.

    Low: 15 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Friday

    Friday: A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy.

    High: 40 °F

    Mostly Cloudy
    then Chance
    Snow and
    Breezy

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15.

    Low: 15 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 35. South wind 7 to 10 mph, with gusts as high as 21 mph.
Tuesday
Increasing clouds, with a high near 57. West wind 10 to 15 mph, with gusts as high as 30 mph.
Tuesday Night
A slight chance of rain between 7pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 33. West wind 9 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a temperature rising to near 38 by 11am, then falling to around 30 during the remainder of the day. Breezy, with a northwest wind 16 to 24 mph, with gusts as high as 34 mph.
Wednesday Night
Mostly clear, with a low around 15. North wind 9 to 17 mph, with gusts as high as 26 mph.
Thursday
Mostly sunny, with a high near 29.
Thursday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 22.
Friday
A 30 percent chance of snow after noon. Mostly cloudy, with a high near 40. Breezy.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15.
Saturday
Mostly cloudy, with a high near 24.
Saturday Night
Mostly cloudy, with a low around 6.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Partly cloudy, with a low around 9.
M.L.King Day
Mostly sunny, with a high near 31.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chesterfield IL
 39.24°N 90.09°W (Elev. 551 ft)
Last Update:
9:41 pm CST Jan 12, 2026
Forecast Valid:
12am CST Jan 13, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation