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.

Overcast

70°F

21°C

Humidity 48%
Wind Speed NW 5 mph
Barometer 29.96 in
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 13 May 12:35 am CDT
Extended Forecast for

Chesterfield IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy early, then gradual clearing, with a low around 55. West wind 7 to 9 mph becoming northwest.

    Low: 55 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 72. Northwest wind 8 to 15 mph, with gusts as high as 22 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 44. North wind 5 to 8 mph becoming calm in the evening.

    Low: 44 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 52. Southeast wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 52 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 50%.

    High: 84 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.

    Low: 62 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy early, then gradual clearing, with a low around 55. West wind 7 to 9 mph becoming northwest.
Wednesday
Sunny, with a high near 72. Northwest wind 8 to 15 mph, with gusts as high as 22 mph.
Wednesday Night
Clear, with a low around 44. North wind 5 to 8 mph becoming calm in the evening.
Thursday
Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 52. Southeast wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly sunny, with a high near 84. Chance of precipitation is 50%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 61.
Saturday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 86.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 62. Chance of precipitation is 30%.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Monday
Showers and thunderstorms likely. Partly sunny, with a high near 88. Chance of precipitation is 60%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chesterfield IL
 39.24°N 90.09°W (Elev. 551 ft)
Last Update:
9:21 pm CDT May 12, 2026
Forecast Valid:
12am CDT May 13, 2026-6pm CDT May 19, 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