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

79°F

26°C

Humidity 74%
Wind Speed N 6 mph
Barometer 30.02 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 6 Jul 8:50 pm CDT
Extended Forecast for

Mount Olive IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 84. Northeast wind 3 to 7 mph.

    High: 84 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86. Calm wind.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Light south wind.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91.

    High: 91 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 70. Chance of precipitation is 70%.

    Low: 70 °F

    T-storms
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 84. Northeast wind 3 to 7 mph.
Tuesday Night
Mostly clear, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 86. Calm wind.
Wednesday Night
Mostly clear, with a low around 68. Light south wind.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91.
Thursday Night
Showers and thunderstorms likely before 1am, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 70. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 87. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 67.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Olive IL
 39.07°N 89.73°W (Elev. 669 ft)
Last Update:
6:26 pm CDT Jul 6, 2026
Forecast Valid:
9pm CDT Jul 6, 2026-6pm CDT Jul 13, 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