National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Mostly Cloudy

84°F

29°C

Humidity 49%
Wind Speed E 6 mph
Barometer 29.98 in (1014.8 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Jun 1:53 pm CDT
Extended Forecast for

Smithton IL

Flood Watch June 21, 07:00am until June 22, 07:00am
Click here for hazard details and duration
Flood Watch

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. Light northwest wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 85. Southeast wind 6 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%.

    High: 85 °F

    T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms before 4am, then scattered showers. Low around 67. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.

    Low: 67 °F

    T-storms then
    Showers
    Likely

  • Monday

    Monday: Isolated showers before 1pm. Mostly cloudy, with a high near 78. West wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 20%.

    High: 78 °F

    Isolated
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 62 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 85. Light northwest wind.
Tonight
Partly cloudy, with a low around 66. Northeast wind around 5 mph becoming calm in the evening.
Sunday
Showers and thunderstorms likely, mainly after 5pm. Mostly cloudy, with a high near 85. Southeast wind 6 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms before 4am, then scattered showers. Low around 67. Southwest wind 8 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 90%.
Monday
Isolated showers before 1pm. Mostly cloudy, with a high near 78. West wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 62.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 62.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.41°N 89.99°W (Elev. 453 ft)
Last Update:
1:26 pm CDT Jun 20, 2026
Forecast Valid:
2pm CDT Jun 20, 2026-6pm CDT Jun 26, 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