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.

Thunderstorm in Vicinity

80°F

27°C

Humidity 85%
Wind Speed S 7 mph
Barometer 29.90 in (1012.1 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 27 Jun 11:53 am CDT
Extended Forecast for

Smithton IL

Extreme Heat Watch June 28, 12:00pm until July 3, 12:00am
Flood Advisory until June 27, 03:15pm
Click here for hazard details and duration
Extreme Heat Watch
Flood Advisory
  •  
    Flood Advisory until June 27, 03:15pm

    NOW until 3:15pm Sat

    Flood Advisory

  • This Afternoon

    High: 85 °F

    T-storms
    Likely

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly between midnight and 5am. Partly cloudy, with a low around 71. Light south wind.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 92. Heat index values as high as 106. South wind 5 to 9 mph.

    High: 92 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 73. South wind 5 to 8 mph.

    Low: 73 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95. South wind 5 to 10 mph.

    High: 95 °F

    Sunny

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 75.

    Low: 75 °F

    Clear

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 85. Southwest wind around 6 mph. Chance of precipitation is 70%.
Tonight
A 40 percent chance of showers and thunderstorms, mainly between midnight and 5am. Partly cloudy, with a low around 71. Light south wind.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 92. Heat index values as high as 106. South wind 5 to 9 mph.
Sunday Night
Mostly clear, with a low around 73. South wind 5 to 8 mph.
Monday
Sunny, with a high near 95. South wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Clear, with a low around 75.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Clear, with a low around 76.
Thursday
Sunny, with a high near 93.
Thursday Night
Mostly clear, with a low around 75.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.41°N 89.99°W (Elev. 453 ft)
Last Update:
11:36 am CDT Jun 27, 2026
Forecast Valid:
12pm CDT Jun 27, 2026-6pm CDT Jul 3, 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