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

14°F

-10°C

Humidity 51%
Wind Speed W 5 mph
Barometer 30.45 in (1031.7 mb)
Dewpoint -1°F (-18°C)
Visibility 10.00 mi
Wind Chill6°F (-14°C)
Last update 19 Jan 10:53 pm CST
Extended Forecast for

Smithton IL

  • Tonight

    Tonight: Mostly clear, with a low around 12. Light and variable wind.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, then gradually becoming sunny, with a high near 38. Light south wind increasing to 6 to 11 mph in the morning.

    High: 38 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 29. South wind 10 to 14 mph, with gusts as high as 26 mph.

    Low: 29 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 46 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. West wind 5 to 7 mph becoming northwest after midnight.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 19.

    High: 19 °F

    Cold

  • Friday Night

    Friday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 2.

    Low: 2 °F

    Chance Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 12. Light and variable wind.
Tuesday
Partly sunny, then gradually becoming sunny, with a high near 38. Light south wind increasing to 6 to 11 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 29. South wind 10 to 14 mph, with gusts as high as 26 mph.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 6 to 13 mph, with gusts as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 24. West wind 5 to 7 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 37.
Thursday Night
Mostly cloudy, with a low around 12.
Friday
Mostly cloudy and cold, with a high near 19.
Friday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 2.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 13.
Saturday Night
A 30 percent chance of snow. Partly cloudy, with a low around 5.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Mostly clear, with a low around 9.
Monday
Sunny, with a high near 34.
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ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.41°N 89.99°W (Elev. 453 ft)
Last Update:
10:51 pm CST Jan 19, 2026
Forecast Valid:
11pm CST Jan 19, 2026-6pm CST Jan 26, 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