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

48°F

9°C

Humidity 62%
Wind Speed SE 6 mph
Barometer 29.89 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 26 Feb 6:45 pm CST
Extended Forecast for

Chesterfield IL

  • Tonight

    Tonight: Clear, with a low around 33. Calm wind becoming southwest around 5 mph after midnight.

    Low: 33 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 67. South wind 6 to 15 mph, with gusts as high as 22 mph.

    High: 67 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 35. Southwest wind 6 to 9 mph becoming northeast after midnight.

    Low: 35 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 57. East wind 6 to 11 mph.

    High: 57 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. North wind 11 to 14 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Chance of precipitation is 40%.

    High: 39 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow, mainly before midnight. Low around 25. Chance of precipitation is 80%.

    Low: 25 °F

    Rain/Snow
    then Chance
    Rain/Snow

  • Monday

    Monday: A slight chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.

    High: 39 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Chance Rain

Detailed Forecast

Tonight
Clear, with a low around 33. Calm wind becoming southwest around 5 mph after midnight.
Friday
Sunny, with a high near 67. South wind 6 to 15 mph, with gusts as high as 22 mph.
Friday Night
Mostly clear, with a low around 35. Southwest wind 6 to 9 mph becoming northeast after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 57. East wind 6 to 11 mph.
Saturday Night
Partly cloudy, with a low around 25. North wind 11 to 14 mph, with gusts as high as 21 mph.
Sunday
A chance of rain and snow after noon. Mostly cloudy, with a high near 39. Chance of precipitation is 40%.
Sunday Night
Rain and snow, mainly before midnight. Low around 25. Chance of precipitation is 80%.
Monday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.
Monday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 27.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 42.
Tuesday Night
Rain likely. Cloudy, with a low around 33. Chance of precipitation is 60%.
Wednesday
Rain likely. Cloudy, with a high near 54. Chance of precipitation is 60%.
Wednesday Night
Rain likely. Cloudy, with a low around 43. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chesterfield IL
 39.26°N 90.06°W (Elev. 600 ft)
Last Update:
4:51 pm CST Feb 26, 2026
Forecast Valid:
6pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation