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.

Partly Cloudy

66°F

19°C

Humidity 80%
Wind Speed E 5 mph
Barometer 29.90 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 21 Jun 5:35 am CDT
Extended Forecast for

Chesterfield IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Today

    Today: Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 78. East wind 7 to 14 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.

    High: 78 °F

    Chance
    T-storms then
    Heavy Rain

  • Tonight

    Tonight: Showers and thunderstorms, mainly before midnight. Some of the storms could produce heavy rainfall. Low around 58. Southwest wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 80%.

    Low: 58 °F

    Heavy Rain
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Mostly cloudy, with a high near 74. North wind 9 to 11 mph.

    High: 74 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 55. North wind around 6 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 78. Light northeast wind.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 81.

    High: 81 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 78. East wind 7 to 14 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 90%.
Tonight
Showers and thunderstorms, mainly before midnight. Some of the storms could produce heavy rainfall. Low around 58. Southwest wind 8 to 13 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 80%.
Monday
Mostly cloudy, with a high near 74. North wind 9 to 11 mph.
Monday Night
Partly cloudy, with a low around 55. North wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 78. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 80.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 59. Chance of precipitation is 20%.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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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:
5:31 am CDT Jun 21, 2026
Forecast Valid:
6am CDT Jun 21, 2026-6pm CDT Jun 27, 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