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.

Partly Cloudy

95°F

35°C

Humidity 67%
Wind Speed NW 10 mph
Barometer 29.89 in
Dewpoint 82°F (28°C)
Visibility 10.00 mi
Heat Index120°F (49°C)
Last update 26 Jul 3:45 pm CDT
Extended Forecast for

Mount Olive IL

Extreme Heat Warning July 26, 04:11pm until July 27, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 26, 04:11pm until July 27, 09:00pm

    NOW until 9:00pm Mon

    Extreme Heat Warning

  • This Afternoon

    High: 93 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 93. Heat index values as high as 109. Light south wind increasing to 5 to 10 mph in the morning.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 76. Southwest wind around 7 mph becoming northwest after midnight.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. North wind 7 to 10 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 93. Heat index values as high as 113. West wind around 5 mph. Chance of precipitation is 30%.
Tonight
Isolated showers and thunderstorms before 9pm. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 20%.
Monday
Sunny, with a high near 93. Heat index values as high as 109. Light south wind increasing to 5 to 10 mph in the morning.
Monday Night
Mostly clear, with a low around 76. Southwest wind around 7 mph becoming northwest after midnight.
Tuesday
Sunny, with a high near 88. North wind 7 to 10 mph.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
Sunny, with a high near 86.
Thursday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 67.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 81.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Sunny, with a high near 83.
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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 Jul 26, 2026
Forecast Valid:
4pm CDT Jul 26, 2026-6pm CDT Aug 2, 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