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 94%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 11 Oct 6:50 am CDT
Extended Forecast for

Chesterfield IL

  • Today

    Today: Sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 62. South wind 3 to 5 mph.

    Low: 62 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Partly sunny, then gradually becoming sunny, with a high near 93. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 93 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 69. Southwest wind around 8 mph.

    Low: 69 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. West wind 7 to 10 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.

    High: 81 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.

    Low: 58 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.

    High: 76 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 87. Light and variable wind.
Tonight
Increasing clouds, with a low around 62. South wind 3 to 5 mph.
Columbus Day
Partly sunny, then gradually becoming sunny, with a high near 93. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Monday Night
Clear, with a low around 69. Southwest wind around 8 mph.
Tuesday
Sunny, with a high near 93. West wind 7 to 10 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 70%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 50.
Friday
Partly sunny, with a high near 66.
Friday Night
Partly cloudy, with a low around 38.
Saturday
Sunny, with a high near 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:
5:26 am CDT Oct 11, 2026
Forecast Valid:
7am CDT Oct 11, 2026-6pm CDT Oct 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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