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.

Fog/Mist

47°F

8°C

Humidity 95%
Wind Speed SE 7 mph
Barometer 29.96 in
Dewpoint 46°F (8°C)
Visibility 3.00 mi
Wind Chill44°F (7°C)
Last update 27 Dec 5:15 am CST
Extended Forecast for

Chesterfield IL

  • Today

    Today: Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 60. Southeast wind 5 to 11 mph.

    High: 60 °F

    Areas Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 1am. Cloudy, with a low around 56. South wind around 11 mph.

    Low: 56 °F

    Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2pm. Temperature rising to near 67 by 11am, then falling to around 51 during the remainder of the day. Breezy, with a south wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 80%.

    High: 67 °F⇓

    Chance
    Showers then
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 40 percent chance of showers before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 16. Breezy, with a west wind 21 to 26 mph, with gusts as high as 37 mph.

    Low: 16 °F

    Chance
    Showers and
    Blustery then
    Mostly Cloudy
    and Breezy

  • Monday

    Monday: Partly sunny, with a high near 25. Breezy, with a northwest wind 18 to 26 mph, with gusts as high as 36 mph.

    High: 25 °F

    Partly Sunny
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 32.

    High: 32 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 60. Southeast wind 5 to 11 mph.
Tonight
A 30 percent chance of showers, mainly after 1am. Cloudy, with a low around 56. South wind around 11 mph.
Sunday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2pm. Temperature rising to near 67 by 11am, then falling to around 51 during the remainder of the day. Breezy, with a south wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 29 mph. Chance of precipitation is 80%.
Sunday Night
A 40 percent chance of showers before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 16. Breezy, with a west wind 21 to 26 mph, with gusts as high as 37 mph.
Monday
Partly sunny, with a high near 25. Breezy, with a northwest wind 18 to 26 mph, with gusts as high as 36 mph.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Sunny, with a high near 32.
Tuesday Night
Mostly clear, with a low around 23.
Wednesday
Mostly sunny, with a high near 40.
Wednesday Night
Mostly cloudy, with a low around 19.
New Year's Day
Mostly sunny, with a high near 29.
Thursday Night
Mostly clear, with a low around 12.
Friday
Mostly sunny, with a high near 29.
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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:
4:41 am CST Dec 27, 2025
Forecast Valid:
5am CST Dec 27, 2025-6pm CST Jan 2, 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