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

79°F

26°C

Humidity 82%
Wind Speed S 9 mph
Barometer 29.94 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 21 Jun 2:15 am CDT
Extended Forecast for

4 Miles W Greenville IL

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

  • Overnight

    Overnight: Mostly clear, with a low around 74. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Heat index values as high as 105. South wind 10 to 17 mph, with gusts as high as 24 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 74. South wind 7 to 14 mph, with gusts as high as 23 mph.

    Low: 74 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Heat index values as high as 102. South wind 7 to 10 mph.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 74. South wind 6 to 9 mph.

    Low: 74 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 94.

    High: 94 °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 before 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74.

    Low: 74 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 74. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 94. Heat index values as high as 105. South wind 10 to 17 mph, with gusts as high as 24 mph.
Saturday Night
Clear, with a low around 74. South wind 7 to 14 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 94. Heat index values as high as 102. South wind 7 to 10 mph.
Sunday Night
Clear, with a low around 74. South wind 6 to 9 mph.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 92. Chance of precipitation is 20%.
Wednesday Night
Mostly clear, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Greenville IL
 38.91°N 89.48°W (Elev. 499 ft)
Last Update:
12:21 am CDT Jun 21, 2025
Forecast Valid:
2am CDT Jun 21, 2025-6pm CDT Jun 27, 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