National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

89°F

32°C

Humidity 65%
Wind Speed Calm
Barometer 29.96 in (1014.0 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 25 Jul 2:53 pm CDT
Extended Forecast for

Smithton IL

Heat Advisory July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: Mostly clear, with a low around 74. Calm wind.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 93. Heat index values as high as 107. Calm wind. Chance of precipitation is 20%.

    High: 93 °F

    Mostly Sunny
    then Isolated
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 76. Light and variable wind.

    Low: 76 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 97. Heat index values as high as 111. Southwest wind 5 to 8 mph.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Southwest wind around 7 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Wednesday Night

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

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 74. Calm wind.
Sunday
Isolated showers and thunderstorms after 4pm. Mostly sunny, with a high near 93. Heat index values as high as 107. Calm wind. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 76. Light and variable wind.
Monday
Mostly sunny and hot, with a high near 97. Heat index values as high as 111. Southwest wind 5 to 8 mph.
Monday Night
Mostly clear, with a low around 77. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 70.
Wednesday
Sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 68.
Thursday
Sunny, with a high near 88.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.41°N 89.99°W (Elev. 453 ft)
Last Update:
2:16 pm CDT Jul 25, 2026
Forecast Valid:
3pm CDT Jul 25, 2026-6pm CDT Aug 1, 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