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

81°F

27°C

Humidity 51%
Wind Speed N 8 mph
Barometer 29.94 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 20 Jun 5:50 pm CDT
Extended Forecast for

6 Miles SE Chesterfield IL

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

  • Tonight

    Tonight: Increasing clouds, with a low around 64. Calm wind becoming east around 5 mph after midnight.

    Low: 64 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers and thunderstorms. High near 79. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.

    High: 79 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 61. Southwest wind 7 to 9 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 61 °F

    T-storms then
    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 10am. Mostly cloudy, with a high near 74. North wind 8 to 10 mph.

    High: 74 °F

    Slight Chance
    Showers then
    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56. North wind 5 to 7 mph becoming calm in the evening.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 64. Calm wind becoming east around 5 mph after midnight.
Sunday
Showers and thunderstorms. High near 79. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 61. Southwest wind 7 to 9 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers before 10am. Mostly cloudy, with a high near 74. North wind 8 to 10 mph.
Monday Night
Partly cloudy, with a low around 56. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Mostly sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 58.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
6 Miles SE Chesterfield IL
 39.21°N 89.98°W (Elev. 568 ft)
Last Update:
6:41 pm CDT Jun 20, 2026
Forecast Valid:
6pm CDT Jun 20, 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