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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Partly Cloudy

91°F

33°C

Humidity 46%
Wind Speed SW 10 mph
Barometer 29.89 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 13 Oct 3:50 pm CDT
Extended Forecast for

Maryville IL

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 6 to 9 mph. Chance of precipitation is 60%.

    Low: 72 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 8am and 2pm. High near 78. Light and variable wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%.

    High: 78 °F

    Showers and
    Patchy Fog
    then Showers
    Likely and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 3am, then showers likely between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 67. Light east wind. Chance of precipitation is 70%.

    Low: 67 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 83. East wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 83 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 50. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 28 mph.

    Low: 50 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 61. Breezy.

    High: 61 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 72. South wind 6 to 9 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 8am and 2pm. High near 78. Light and variable wind becoming west around 5 mph in the afternoon. Chance of precipitation is 90%.
Wednesday Night
A chance of showers and thunderstorms before 3am, then showers likely between 3am and 4am, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 67. Light east wind. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 83. East wind 5 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 50. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Winds could gust as high as 28 mph.
Friday
Mostly sunny, with a high near 61. Breezy.
Friday Night
Mostly clear, with a low around 38.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 51.
Tuesday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Maryville IL
 38.72°N 89.97°W (Elev. 558 ft)
Last Update:
3:01 pm CDT Oct 13, 2026
Forecast Valid:
4pm CDT Oct 13, 2026-6pm CDT Oct 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