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.

Thunderstorm Rain and Breezy

73°F

23°C

Humidity 94%
Wind Speed S 21 G 35 mph
Barometer 29.79 in
Dewpoint 72°F (22°C)
Visibility 1.50 mi
Last update 21 Jun 1:50 pm CDT
Extended Forecast for

4 Miles NNW Royal Lakes IL

Flood Watch June 21, 02:25pm until June 22, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 21, 02:25pm until June 22, 01:00am

    NOW until 1:00am Mon

    Flood Watch

  • This Afternoon

    High: 77 °F

    Heavy Rain

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 7pm. Cloudy, with a low around 60. Southwest wind 7 to 11 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 30%.

    Low: 60 °F

    Scattered
    T-storms then
    Cloudy

  • Monday

    Monday: Cloudy, then gradually becoming mostly sunny, with a high near 73. North wind around 11 mph.

    High: 73 °F

    Decreasing
    Clouds

  • Monday Night

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

    Low: 56 °F

    Mostly Clear

  • Tuesday

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

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 81. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Showers and thunderstorms, mainly before 4pm. Some of the storms could produce heavy rainfall. High near 77. South wind 10 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Tonight
Scattered showers and thunderstorms, mainly before 7pm. Cloudy, with a low around 60. Southwest wind 7 to 11 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 30%.
Monday
Cloudy, then gradually becoming mostly sunny, with a high near 73. North wind around 11 mph.
Monday Night
Mostly clear, with a low around 56. North wind 5 to 7 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 78. Light east wind.
Tuesday Night
Mostly clear, with a low around 59.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83.
Thursday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 62.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNW Royal Lakes IL
 39.17°N 89.98°W (Elev. 587 ft)
Last Update:
1:26 pm CDT Jun 21, 2026
Forecast Valid:
2pm 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