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

76°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 74°F (23°C)
Visibility 7.00 mi
Heat Index76°F (24°C)
Last update 18 Jul 11:15 pm CDT
Extended Forecast for

Maryville IL

Extreme Heat Warning July 19, 12:00pm until July 23, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light southeast wind.

    Low: 74 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. Heat index values as high as 102. South wind 5 to 7 mph becoming west in the afternoon.

    High: 91 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly clear, with a low around 75. South wind around 6 mph. Chance of precipitation is 30%.

    Low: 75 °F

    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 107. West wind 5 to 7 mph.

    High: 95 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76. South wind 3 to 5 mph.

    Low: 76 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

    High: 94 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77.

    Low: 77 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 95.

    High: 95 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light southeast wind.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. Heat index values as high as 102. South wind 5 to 7 mph becoming west in the afternoon.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly clear, with a low around 75. South wind around 6 mph. Chance of precipitation is 30%.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 107. West wind 5 to 7 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76. South wind 3 to 5 mph.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 77.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 95.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 98.
Thursday Night
Mostly clear, with a low around 77.
Friday
Sunny and hot, with a high near 97.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Maryville IL
 38.72°N 89.97°W (Elev. 558 ft)
Last Update:
9:36 pm CDT Jul 18, 2025
Forecast Valid:
11pm CDT Jul 18, 2025-6pm CDT Jul 25, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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