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.

Overcast

43°F

6°C

Humidity 71%
Wind Speed NW 18 G 25 mph
Barometer 30.11 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 11 Mar 5:45 pm CDT
Extended Forecast for

Chesterfield IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 29. Blustery, with a northwest wind 15 to 20 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 28 mph.

    Low: 29 °F

    Gradual
    Clearing and
    Blustery then
    Clear

  • Thursday

    Thursday: Sunny, with a high near 52. West wind 5 to 13 mph, with gusts as high as 20 mph.

    High: 52 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 40. Breezy, with a south wind 13 to 22 mph, with gusts as high as 32 mph.

    Low: 40 °F

    Partly Cloudy
    and Breezy

  • Friday

    Friday: Partly sunny, with a high near 57. West wind 14 to 18 mph, with gusts as high as 26 mph.

    High: 57 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. Northwest wind around 7 mph becoming northeast after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 1am. Cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 63. Breezy. Chance of precipitation is 90%.

    High: 63 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 20. Breezy. Chance of precipitation is 30%.

    Low: 20 °F

    Chance
    Rain/Snow and
    Breezy

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 29. Blustery, with a northwest wind 15 to 20 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 52. West wind 5 to 13 mph, with gusts as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 40. Breezy, with a south wind 13 to 22 mph, with gusts as high as 32 mph.
Friday
Partly sunny, with a high near 57. West wind 14 to 18 mph, with gusts as high as 26 mph.
Friday Night
Mostly cloudy, with a low around 33. Northwest wind around 7 mph becoming northeast after midnight.
Saturday
Mostly cloudy, with a high near 57.
Saturday Night
A 20 percent chance of rain after 1am. Cloudy, with a low around 46.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 63. Breezy. Chance of precipitation is 90%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 20. Breezy. Chance of precipitation is 30%.
Monday
Partly sunny, with a high near 32. Breezy.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, 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:
5:36 pm CDT Mar 11, 2026
Forecast Valid:
6pm CDT Mar 11, 2026-6pm CDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation