National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Lala Impacting Hawaii; Flash Flooding Risks; Excessive Heat

Lala will continue to impact Hawaii through the weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Thunderstorms, heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians and the mid-Atlantic through today. Record heat continues for areas of the Mississippi Valley into the Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

79°F

26°C

Humidity 89%
Wind Speed SW 5 mph
Barometer 30.04 in
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 16 Aug 11:50 am CDT
Extended Forecast for

Aviston IL

Extreme Heat Warning August 16, 12:35pm until August 16, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 16, 12:35pm until August 16, 09:00pm

    NOW until 9:00pm Sun

    Extreme Heat Warning

  • This Afternoon

    High: 92 °F

    Partly Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 1am. Increasing clouds, with a low around 71. Light and variable wind. Chance of precipitation is 60%.

    Low: 71 °F

    T-storms
    Likely

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 84. North wind 3 to 7 mph.

    High: 84 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65. Light north wind.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 87. Calm wind.

    High: 87 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 87.

    High: 87 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 92. Heat index values as high as 109. West wind 3 to 5 mph.
Tonight
Showers and thunderstorms likely, mainly before 1am. Increasing clouds, with a low around 71. Light and variable wind. Chance of precipitation is 60%.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 84. North wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 65. Light north wind.
Tuesday
Sunny, with a high near 87. Calm wind.
Tuesday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Wednesday
A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 87.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 64.
Friday
Mostly sunny, with a high near 83.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Aviston IL
 38.62°N 89.61°W (Elev. 482 ft)
Last Update:
11:56 am CDT Aug 16, 2026
Forecast Valid:
12pm CDT Aug 16, 2026-6pm CDT Aug 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