Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

89°F

32°C

Humidity 59%
Wind Speed SW 9 G 18 mph
Barometer 29.96 in (1013.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 11 Aug 10:54 am CDT
Extended Forecast for

Silex MO

Heat Advisory August 11, 12:31pm until August 12, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 11, 12:31pm until August 12, 08:00pm

    NOW until 8:00pm Wed

    Heat Advisory

  • This Afternoon

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 77. Light south wind.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Scattered showers and thunderstorms, mainly between 9am and noon.  Mostly sunny, with a high near 94. Heat index values as high as 106. Southeast wind around 6 mph becoming southwest in the morning.  Chance of precipitation is 30%.

    High: 94 °F

    Scattered
    T-storms

  • Wednesday Night

    Wednesday Night: Scattered showers and thunderstorms, mainly after 5am.  Partly cloudy, with a low around 75. Calm wind.  Chance of precipitation is 30%.

    Low: 75 °F

    Scattered
    T-storms

  • Thursday

    Thursday: Scattered showers and thunderstorms, mainly before 1pm.  Partly sunny, with a high near 93. Calm wind becoming east around 5 mph in the afternoon.  Chance of precipitation is 30%.

    High: 93 °F

    Scattered
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am.  Mostly cloudy, with a low around 72.

    Low: 72 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: Partly sunny, with a high near 90.

    High: 90 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 95. Heat index values as high as 106. Southwest wind around 7 mph.
Tonight
Partly cloudy, with a low around 77. Light south wind.
Wednesday
Scattered showers and thunderstorms, mainly between 9am and noon. Mostly sunny, with a high near 94. Heat index values as high as 106. Southeast wind around 6 mph becoming southwest in the morning. Chance of precipitation is 30%.
Wednesday Night
Scattered showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 75. Calm wind. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 93. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72.
Friday
Partly sunny, with a high near 90.
Friday Night
Partly cloudy, with a low around 73.
Saturday
Mostly sunny, with a high near 95.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 94.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
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ABOUT THIS FORECAST

 
Point Forecast:
Silex MO
 39.13°N 91.06°W (Elev. 600 ft)
12:21 pm CDT Aug 11, 2026
12pm CDT Aug 11, 2026-6pm CDT Aug 17, 2026
 
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Additional Resources

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