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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Mostly Cloudy

77°F

25°C

Humidity 42%
Wind Speed S 16 G 38 mph
Barometer 29.89 in (1011.9 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 12 Apr 5:53 pm CDT
Extended Forecast for

Smithton IL

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 66. South wind 10 to 17 mph, with gusts as high as 28 mph.

    Low: 66 °F

    Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 83. South wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 83 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 67. South wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 67 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 86 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 68. South wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.

    Low: 63 °F

    Showers
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 84.

    High: 84 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 66. South wind 10 to 17 mph, with gusts as high as 28 mph.
Monday
Partly sunny, with a high near 83. South wind 9 to 16 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 67. South wind 10 to 14 mph, with gusts as high as 24 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. South wind 10 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 68. South wind 10 to 14 mph, with gusts as high as 22 mph.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 61.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 78.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 63.
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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:
6:35 pm CDT Apr 12, 2026
Forecast Valid:
6pm CDT Apr 12, 2026-6pm CDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation