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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

45°F

7°C

Humidity 87%
Wind Speed Vrbl 3 mph
Barometer 30.02 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 15 Feb 7:50 pm CST
Extended Forecast for

Chesterfield IL

  • Tonight

    Tonight: Patchy dense fog after 1am. Otherwise, partly cloudy, with a low around 38. Calm wind becoming southwest around 6 mph after midnight.

    Low: 38 °F

    Mostly Clear
    then Patchy
    Dense Fog

  • Washington's Birthday

    Washington's Birthday: Patchy dense fog before 8am. Otherwise, partly sunny, with a high near 63. South wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 63 °F

    Patchy Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. South wind around 9 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 62. South wind 8 to 18 mph, with gusts as high as 28 mph.

    High: 62 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 54. Breezy, with a south wind 17 to 21 mph, with gusts as high as 32 mph.

    Low: 54 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 69.

    High: 69 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 70. Chance of precipitation is 20%.

    High: 70 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 35.

    Low: 35 °F

    Slight Chance
    T-storms then
    Mostly Clear

Detailed Forecast

Tonight
Patchy dense fog after 1am. Otherwise, partly cloudy, with a low around 38. Calm wind becoming southwest around 6 mph after midnight.
Washington's Birthday
Patchy dense fog before 8am. Otherwise, partly sunny, with a high near 63. South wind 6 to 13 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 42. South wind around 9 mph.
Tuesday
Mostly cloudy, with a high near 62. South wind 8 to 18 mph, with gusts as high as 28 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 54. Breezy, with a south wind 17 to 21 mph, with gusts as high as 32 mph.
Wednesday
Sunny, with a high near 69.
Wednesday Night
Partly cloudy, with a low around 43.
Thursday
A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 70. Chance of precipitation is 20%.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 35.
Friday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 50.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Saturday
A 20 percent chance of rain. Mostly sunny, with a high near 46.
Saturday Night
A slight chance of rain and snow. Mostly clear, with a low around 24. Chance of precipitation is 20%.
Sunday
Mostly sunny, with a high near 43.
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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:
7:41 pm CST Feb 15, 2026
Forecast Valid:
8pm CST Feb 15, 2026-6pm CST Feb 22, 2026
 
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Additional Resources

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Chance of Precipitation