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.

Mostly Cloudy

79°F

26°C

Humidity 84%
Wind Speed SW 9 mph
Barometer 29.91 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 15 Oct 2:50 pm CDT
Extended Forecast for

Mount Olive IL

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms, mainly before 5pm. Mostly cloudy, with a high near 78. Southwest wind around 10 mph.

    High: 78 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Increasing clouds, with a low around 44. Southwest wind 10 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.

    Low: 44 °F

    Showers
    Likely

  • Friday

    Friday: A 30 percent chance of showers after 4pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 56. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 28 mph.

    High: 56 °F

    Breezy.
    Mostly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. North wind 8 to 18 mph.

    Low: 35 °F

    Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 59. North wind around 5 mph becoming calm in the morning.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 33.

    Low: 33 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms, mainly before 5pm. Mostly cloudy, with a high near 78. Southwest wind around 10 mph.
Tonight
Showers and thunderstorms likely before 1am, then a slight chance of showers between 1am and 2am. Increasing clouds, with a low around 44. Southwest wind 10 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%.
Friday
A 30 percent chance of showers after 4pm. Cloudy through mid morning, then becoming mostly sunny, with a high near 56. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 28 mph.
Friday Night
A 30 percent chance of showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. North wind 8 to 18 mph.
Saturday
Sunny, with a high near 59. North wind around 5 mph becoming calm in the morning.
Saturday Night
Clear, with a low around 33.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 70.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Olive IL
 39.07°N 89.73°W (Elev. 669 ft)
Last Update:
2:26 pm CDT Oct 15, 2026
Forecast Valid:
2pm CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
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