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.

Fair

74°F

23°C

Humidity 95%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 73°F (23°C)
Visibility 7.00 mi
Last update 17 Aug 2:55 am CDT
Extended Forecast for

3 Miles NNW Royal Lakes IL

Heat Advisory August 17, 03:16am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 03:16am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Overnight

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 95. Heat index values as high as 103. Light and variable wind.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. Light and variable wind.

    Low: 74 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94. Heat index values as high as 101. South wind 3 to 5 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Light southeast wind.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 91. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 84.

    High: 84 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 74. Light south wind.
Sunday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny, with a high near 95. Heat index values as high as 103. Light and variable wind.
Sunday Night
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. Light and variable wind.
Monday
Sunny, with a high near 94. Heat index values as high as 101. South wind 3 to 5 mph.
Monday Night
Mostly clear, with a low around 73. Light southeast wind.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 91. Chance of precipitation is 30%.
Tuesday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Wednesday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Royal Lakes IL
 39.17°N 89.98°W (Elev. 587 ft)
Last Update:
2:11 am CDT Aug 17, 2025
Forecast Valid:
3am CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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