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.

Fog/Mist Rain

70°F

21°C

Humidity 94%
Wind Speed SE 8 mph
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 2.00 mi
Last update 15 Oct 9:50 am CDT
Extended Forecast for

Mount Olive IL

  • Today

    Today: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 11am. High near 78. South wind 7 to 10 mph. Chance of precipitation is 80%.

    High: 78 °F

    Showers and
    Patchy Fog

  • Tonight

    Tonight: Showers and thunderstorms likely before 2am, then isolated showers between 2am and 3am. Increasing clouds, with a low around 45. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.

    Low: 45 °F

    Showers
    Likely

  • Friday

    Friday: Partly 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

    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. North wind 9 to 17 mph.

    Low: 36 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 59. North wind around 6 mph becoming calm in the afternoon.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 11am. High near 78. South wind 7 to 10 mph. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms likely before 2am, then isolated showers between 2am and 3am. Increasing clouds, with a low around 45. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.
Friday
Partly sunny, with a high near 56. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. North wind 9 to 17 mph.
Saturday
Sunny, with a high near 59. North wind around 6 mph becoming calm in the afternoon.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 36.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 40.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Olive IL
 39.07°N 89.76°W (Elev. 650 ft)
Last Update:
9:16 am CDT Oct 15, 2026
Forecast Valid:
10am CDT Oct 15, 2026-6pm CDT Oct 21, 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