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.

Fair

58°F

14°C

Humidity 42%
Wind Speed Calm
Barometer 30.50 in (1032.7 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 17 Oct 2:53 pm CDT
Extended Forecast for

Smithton IL

Frost Advisory October 18, 01:00am until October 18, 09:00am
Click here for hazard details and duration
Frost Advisory

  • Tonight

    Tonight: Patchy frost after 4am. Otherwise, clear, with a low around 36. Light and variable wind.

    Low: 36 °F

    Clear then
    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 70. Calm wind becoming south around 6 mph in the morning.

    High: 70 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 37. Light and variable wind.

    Low: 37 °F

    Clear

  • Monday

    Monday: Patchy frost before 8am. Otherwise, sunny, with a high near 73. Calm wind.

    High: 73 °F

    Patchy Frost
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy frost after 4am. Otherwise, clear, with a low around 36. Light and variable wind.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 70. Calm wind becoming south around 6 mph in the morning.
Sunday Night
Clear, with a low around 37. Light and variable wind.
Monday
Patchy frost before 8am. Otherwise, sunny, with a high near 73. Calm wind.
Monday Night
Mostly clear, with a low around 40. Calm wind.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Sunny, with a high near 80.
Thursday Night
Mostly clear, with a low around 49.
Friday
Sunny, with a high near 79.
Friday Night
Mostly clear, with a low around 49.
Saturday
Mostly sunny, with a high near 80.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Smithton IL
 38.41°N 89.99°W (Elev. 453 ft)
Last Update:
2:20 pm CDT Oct 17, 2026
Forecast Valid:
3pm CDT Oct 17, 2026-6pm CDT Oct 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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