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

81°F

27°C

Humidity 89%
Wind Speed S 9 mph
Barometer 30.02 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 26 Jul 7:50 am CDT
Extended Forecast for

Mount Olive IL

Heat Advisory July 26, 07:57am until July 29, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 26, 07:57am until July 29, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Today

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. South wind 5 to 7 mph. Chance of precipitation is 30%.

    Low: 74 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind around 7 mph.

    High: 91 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 74. Light south wind.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 94. Calm wind becoming west around 6 mph in the morning.

    High: 94 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 91. Heat index values as high as 102. South wind 6 to 10 mph.
Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 74. South wind 5 to 7 mph. Chance of precipitation is 30%.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind around 7 mph.
Sunday Night
Partly cloudy, with a low around 74. Light south wind.
Monday
Mostly sunny, with a high near 94. Calm wind becoming west around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 94.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 75.
Wednesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 69.
Thursday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Friday
Mostly 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:
5:51 am CDT Jul 26, 2025
Forecast Valid:
7am CDT Jul 26, 2025-6pm CDT Aug 1, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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