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

65°F

18°C

Humidity 93%
Wind Speed SW 5 mph
Barometer 29.80 in (1008.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Apr 11:53 pm CDT
Extended Forecast for

Smithton IL

  • Overnight

    Overnight: Partly cloudy, with a low around 54. Northwest wind around 9 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 70. Northwest wind 5 to 7 mph becoming north in the afternoon.

    High: 70 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am. Low around 51. Northeast wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 66. Northwest wind 11 to 14 mph, with gusts as high as 21 mph.

    High: 66 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42. North wind 5 to 10 mph becoming light after midnight.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 54. Northwest wind around 9 mph, with gusts as high as 20 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Mostly sunny, with a high near 70. Northwest wind 5 to 7 mph becoming north in the afternoon.
Tuesday Night
Showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am. Low around 51. Northeast wind 6 to 9 mph becoming north after midnight. Chance of precipitation is 80%.
Wednesday
Mostly sunny, with a high near 66. Northwest wind 11 to 14 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 42. North wind 5 to 10 mph becoming light after midnight.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Partly sunny, with a high near 63.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 65.
Saturday Night
Mostly clear, with a low around 43.
Sunday
Sunny, with a high near 74.
Sunday Night
Mostly clear, with a low around 50.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75.
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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:
10:46 pm CDT Apr 27, 2026
Forecast Valid:
12am CDT Apr 28, 2026-6pm CDT May 4, 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