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.

Fair

94°F

34°C

Humidity 48%
Wind Speed S 7 mph
Barometer 30.01 in (1015.7 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index102°F (39°C)
Last update 2 Jul 5:53 pm CDT
Extended Forecast for

Smithton IL

Extreme Heat Warning July 2, 06:50pm until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 2, 06:50pm until July 4, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Tonight

    Low: 75 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming south 5 to 8 mph in the morning.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.

    Low: 75 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Independence Day

    Independence Day: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming southwest around 6 mph in the morning.

    High: 94 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light south wind.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

    High: 91 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

    High: 89 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. South wind 5 to 8 mph becoming calm after midnight.
Friday
A 20 percent chance of showers and thunderstorms after 3pm. Sunny, with a high near 95. Heat index values as high as 107. Calm wind becoming south 5 to 8 mph in the morning.
Friday Night
A 20 percent chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 75. South wind around 6 mph becoming calm in the evening.
Independence Day
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming southwest around 6 mph in the morning.
Saturday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Light south wind.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 70. Chance of precipitation is 30%.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 71.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.44°N 89.99°W (Elev. 449 ft)
Last Update:
6:06 pm CDT Jul 2, 2026
Forecast Valid:
6pm CDT Jul 2, 2026-6pm CDT Jul 9, 2026
 
Forecast Discussion
 
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Additional Resources

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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