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.

Mostly Cloudy

84°F

29°C

Humidity 66%
Wind Speed Vrbl 5 mph
Barometer 29.98 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 5 Jul 12:50 pm CDT
Extended Forecast for

Chesterfield IL

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 84. North wind 5 to 7 mph.

    High: 84 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Mostly clear, with a low around 64. North wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 83. North wind 5 to 8 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62. North wind 5 to 7 mph becoming calm in the evening.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 84. North wind 5 to 7 mph.
Tonight
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Mostly clear, with a low around 64. North wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 83. North wind 5 to 8 mph.
Monday Night
Partly cloudy, with a low around 62. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Sunny, with a high near 88.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 69.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90.
Thursday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 86.
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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:
11:46 am CDT Jul 5, 2026
Forecast Valid:
1pm CDT Jul 5, 2026-6pm CDT Jul 11, 2026
 
Forecast Discussion
 
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Additional Resources

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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