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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

91°F

33°C

Humidity 56%
Wind Speed SW 5 mph
Barometer 30.03 in (1016.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 3 Jul 2:53 pm CDT
Extended Forecast for

Smithton IL

Extreme Heat Warning July 3, 03:54pm until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 3, 03:54pm until July 4, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • This Afternoon

    High: 94 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 74. South wind 5 to 7 mph becoming calm in the evening.

    Low: 74 °F

    Mostly Clear

  • Independence Day

    Independence Day: A 40 percent chance of showers and thunderstorms, mainly 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

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Mostly clear, then becoming mostly cloudy toward daybreak, with a low around 73. South wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the morning.

    High: 90 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 50%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 30%.

    High: 88 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Heat index values as high as 107. South wind around 8 mph.
Tonight
Mostly clear, with a low around 74. South wind 5 to 7 mph becoming calm in the evening.
Independence Day
A 40 percent chance of showers and thunderstorms, mainly 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 40 percent chance of showers and thunderstorms, mainly after midnight. Mostly clear, then becoming mostly cloudy toward daybreak, with a low around 73. South wind around 5 mph becoming calm in the evening.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the morning.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 50%.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 69.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Wednesday Night
A 20 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 92.
Thursday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Friday
A 40 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:
2:11 pm CDT Jul 3, 2026
Forecast Valid:
3pm CDT Jul 3, 2026-6pm CDT Jul 10, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation