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

46°F

8°C

Humidity 46%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 13 Mar 10:15 pm CDT
Extended Forecast for

Chesterfield IL

  • Tonight

    Tonight: Partly cloudy, with a low around 33. Northwest wind around 6 mph becoming light and variable.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 59. East wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 59 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50. Southeast wind 11 to 16 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 68. Breezy, with a south wind 18 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%.

    High: 68 °F

    Breezy.
    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 19. Blustery, with a west wind 22 to 28 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 19 °F

    Rain/Snow and
    Blustery

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.

    High: 25 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 9. Blustery.

    Low: 9 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 33.

    High: 33 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.

    Low: 24 °F

    Chance Snow
    then Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. Northwest wind around 6 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 59. East wind 7 to 15 mph, with gusts as high as 23 mph.
Saturday Night
Partly cloudy, with a low around 50. Southeast wind 11 to 16 mph, with gusts as high as 25 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 68. Breezy, with a south wind 18 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 19. Blustery, with a west wind 22 to 28 mph, with gusts as high as 46 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.
Monday Night
Mostly clear, with a low around 9. Blustery.
Tuesday
Sunny, with a high near 33.
Tuesday Night
A chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Wednesday
Mostly sunny, with a high near 59.
Wednesday Night
Mostly clear, with a low around 36.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 41.
Friday
Sunny, with a high near 65.
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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:
8:31 pm CDT Mar 13, 2026
Forecast Valid:
10pm CDT Mar 13, 2026-6pm CDT Mar 20, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation