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

91°F

33°C

Humidity 67%
Wind Speed SE 6 mph
Barometer 30.00 in
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index107°F (42°C)
Last update 17 Aug 4:50 pm CDT
Extended Forecast for

2 Miles WSW Pierron IL

Heat Advisory August 17, 05:16pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 05:16pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Tonight

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Isolated showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 94. Heat index values as high as 105. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.

    High: 94 °F

    Patchy Fog
    then Isolated
    T-storms

  • Monday Night

    Monday Night: Isolated showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 74. Light southeast wind. Chance of precipitation is 20%.

    Low: 74 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming west around 5 mph in the afternoon.

    High: 91 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Light north wind. Chance of precipitation is 40%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 75. East wind 3 to 5 mph.
Monday
Isolated showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 94. Heat index values as high as 105. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.
Monday Night
Isolated showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly clear, with a low around 74. Light southeast wind. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 102. Calm wind becoming west around 5 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Light north wind. Chance of precipitation is 40%.
Wednesday
A slight chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 87.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Pierron IL
 38.78°N 89.6°W (Elev. 525 ft)
Last Update:
4:16 pm CDT Aug 17, 2025
Forecast Valid:
5pm CDT Aug 17, 2025-6pm CDT Aug 24, 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