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.

Fair

78°F

26°C

Humidity 42%
Wind Speed SE 8 mph
Barometer 30.03 in (1016.8 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 29 Sep 10:53 am CDT
Extended Forecast for

Smithton IL

  • Today

    Today: Sunny, with a high near 83. South wind around 7 mph.

    High: 83 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 62. South wind 3 to 5 mph.

    Low: 62 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Cloudy through mid morning, then gradual clearing, with a high near 89. South wind 5 to 10 mph.

    High: 89 °F

    Gradual
    Clearing

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 69. South wind 6 to 8 mph.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 1pm. Mostly cloudy, with a high near 88. South wind 8 to 13 mph.

    High: 88 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Friday

    Friday: Showers. High near 75. Chance of precipitation is 80%.

    High: 75 °F

    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Chance
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers. Mostly cloudy, with a high near 70.

    High: 70 °F

    Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 83. South wind around 7 mph.
Tonight
Increasing clouds, with a low around 62. South wind 3 to 5 mph.
Wednesday
Cloudy through mid morning, then gradual clearing, with a high near 89. South wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 69. South wind 6 to 8 mph.
Thursday
A 30 percent chance of showers after 1pm. Mostly cloudy, with a high near 88. South wind 8 to 13 mph.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Friday
Showers. High near 75. Chance of precipitation is 80%.
Friday Night
A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 58.
Saturday
A 40 percent chance of showers. Mostly cloudy, with a high near 70.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 58.
Sunday
A 20 percent chance of showers. Partly sunny, with a high near 70.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 70.
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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:
5:46 am CDT Sep 29, 2026
Forecast Valid:
11am CDT Sep 29, 2026-6pm CDT Oct 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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