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

Lala Approaching Hawaii; Flash Flooding Risks; Excessive Heat

Lala, may become a hurricane, is expected to impact Hawaii this weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians continues, with the threat shifting toward the mid-Atlantic later this weekend. Record heat continues for areas of the South. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

82°F

28°C

Humidity 73%
Wind Speed SW 3 mph
Barometer 29.96 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 14 Aug 6:35 am CDT
Extended Forecast for

Williamson IL

Extreme Heat Warning August 14, 06:51am until August 15, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 14, 06:51am until August 15, 09:00pm

    NOW until 9:00pm Sat

    Extreme Heat Warning

  • Today

    High: 93 °F

    Scattered
    T-storms then
    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 75. East wind 3 to 5 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 94. Heat index values as high as 110. Light and variable wind becoming southwest around 6 mph in the morning.

    High: 94 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 75. Light southwest wind.

    Low: 75 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. West wind 3 to 8 mph.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Monday Night

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

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly before 11am. Partly sunny, then gradually becoming sunny, with a high near 93. Heat index values as high as 109. Southeast wind 3 to 5 mph. Chance of precipitation is 50%.
Tonight
Mostly clear, with a low around 75. East wind 3 to 5 mph.
Saturday
Mostly sunny, with a high near 94. Heat index values as high as 110. Light and variable wind becoming southwest around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 75. Light southwest wind.
Sunday
Mostly sunny, with a high near 93. West wind 3 to 8 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 70.
Monday
Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Williamson IL
 38.98°N 89.76°W (Elev. 597 ft)
Last Update:
6:36 am CDT Aug 14, 2026
Forecast Valid:
6am CDT Aug 14, 2026-6pm CDT Aug 20, 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