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

38°F

3°C

Humidity 27%
Wind Speed S 10 mph
Barometer 30.27 in (1025.5 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 20 Jan 3:53 pm CST
Extended Forecast for

Smithton IL

  • Tonight

    Tonight: Increasing clouds, with a low around 28. South wind around 11 mph, with gusts as high as 22 mph.

    Low: 28 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 44. South wind 7 to 10 mph becoming west in the afternoon.

    High: 44 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 23. Southwest wind 5 to 7 mph becoming northwest after midnight.

    Low: 23 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 38. North wind 3 to 5 mph.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.

    Low: 11 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 16.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.

    Low: 3 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 50 percent chance of snow. Cloudy and cold, with a high near 14.

    High: 14 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.

    Low: 8 °F

    Chance Snow

Detailed Forecast

Tonight
Increasing clouds, with a low around 28. South wind around 11 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 44. South wind 7 to 10 mph becoming west in the afternoon.
Wednesday Night
Mostly clear, with a low around 23. Southwest wind 5 to 7 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 38. North wind 3 to 5 mph.
Thursday Night
Mostly cloudy, with a low around 11. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.
Friday
Mostly cloudy and cold, with a high near 16.
Friday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.
Saturday
A 50 percent chance of snow. Cloudy and cold, with a high near 14.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8.
Sunday
Partly sunny, with a high near 22.
Sunday Night
Partly cloudy, with a low around 6.
Monday
Mostly sunny, with a high near 25.
Monday Night
Partly cloudy, with a low around 10.
Tuesday
Mostly sunny, with a high near 36.
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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:
3:15 pm CST Jan 20, 2026
Forecast Valid:
4pm CST Jan 20, 2026-6pm CST Jan 27, 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