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

84°F

29°C

Humidity 51%
Wind Speed SW 8 mph
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Jun 11:50 am CDT
Extended Forecast for

2 Miles E Williamson IL

Extreme Heat Watch June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • This Afternoon

    This Afternoon: Mostly cloudy, then gradually becoming sunny, with a high near 88. South wind 9 to 14 mph.

    High: 88 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Clear, with a low around 74. South wind 9 to 13 mph, with gusts as high as 22 mph.

    Low: 74 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Heat index values as high as 104. South wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. South wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 93. Southwest wind 7 to 11 mph.

    High: 93 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly cloudy, then gradually becoming sunny, with a high near 88. South wind 9 to 14 mph.
Tonight
Clear, with a low around 74. South wind 9 to 13 mph, with gusts as high as 22 mph.
Saturday
Sunny, with a high near 94. Heat index values as high as 104. South wind 10 to 17 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 73. South wind 8 to 13 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 93. Southwest wind 7 to 11 mph.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 93.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Williamson IL
 38.98°N 89.73°W (Elev. 600 ft)
Last Update:
11:37 am CDT Jun 20, 2025
Forecast Valid:
12pm CDT Jun 20, 2025-6pm CDT Jun 26, 2025
 
Forecast Discussion
 
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Additional Resources

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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