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

71°F

22°C

Humidity 68%
Wind Speed SW 8 G 16 mph
Barometer 29.96 in (1014.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 13 Apr 12:53 am CDT
Extended Forecast for

Smithton IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 64. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 64 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. South wind 9 to 17 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 67. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Southwest wind 10 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 87 °F

    Mostly 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 23 mph.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, 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 83.

    High: 83 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 64. South wind around 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 83. South wind 9 to 17 mph, with gusts as high as 25 mph.
Monday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 67. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Tuesday
A slight chance of showers before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Southwest wind 10 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
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 23 mph.
Wednesday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, 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 83.
Thursday Night
Mostly clear, with a low around 62.
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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ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.44°N 89.99°W (Elev. 449 ft)
Last Update:
11:11 pm CDT Apr 12, 2026
Forecast Valid:
1am CDT Apr 13, 2026-6pm CDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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