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.

Overcast

64°F

18°C

Humidity 66%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 16 Jun 12:15 am CDT
Extended Forecast for

Royal Lakes IL

  • Overnight

    Overnight: Mostly clear, with a low around 55. South wind 3 to 6 mph.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly cloudy, then gradually becoming sunny, with a high near 78. West wind 8 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55. West wind 5 to 9 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 88. Breezy, with a south wind 8 to 13 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 36 mph. Chance of precipitation is 40%.

    High: 88 °F

    Chance
    T-storms and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 1am. Low around 66. Breezy, with a west wind 13 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.

    Low: 66 °F

    Showers and
    Breezy

  • Thursday

    Thursday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Friday Night

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

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 55. South wind 3 to 6 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly cloudy, then gradually becoming sunny, with a high near 78. West wind 8 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Tuesday Night
Partly cloudy, with a low around 55. West wind 5 to 9 mph becoming calm in the evening.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 88. Breezy, with a south wind 8 to 13 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 36 mph. Chance of precipitation is 40%.
Wednesday Night
Showers and possibly a thunderstorm before 1am. Low around 66. Breezy, with a west wind 13 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.
Thursday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 55.
Juneteenth
Sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 58.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Monday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Royal Lakes IL
 39.1°N 89.98°W (Elev. 659 ft)
Last Update:
9:31 pm CDT Jun 15, 2026
Forecast Valid:
12am CDT Jun 16, 2026-6pm CDT Jun 22, 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