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

19°F

-7°C

Humidity 57%
Wind Speed NW 15 mph
Barometer 30.19 in (1023.0 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill5°F (-15°C)
Last update 17 Mar 4:53 am CDT
Extended Forecast for

Trenton IL

  • Today

    Today: Increasing clouds, with a high near 34. Northwest wind 6 to 11 mph becoming southwest in the afternoon.

    High: 34 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of snow before 5am, then a chance of rain and snow. Cloudy, with a low around 30. Light southeast wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 23 mph. Chance of precipitation is 40%.

    Low: 30 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 62. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 22 mph.

    High: 62 °F

    Chance Rain
    then Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41. Light south wind.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 71. South wind 3 to 7 mph.

    High: 71 °F

    Mostly Sunny

  • Thursday Night

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

    Low: 47 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 34. Northwest wind 6 to 11 mph becoming southwest in the afternoon.
Tonight
A chance of snow before 5am, then a chance of rain and snow. Cloudy, with a low around 30. Light southeast wind becoming south 9 to 14 mph in the evening. Winds could gust as high as 23 mph. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of rain before 7am. Cloudy through mid morning, then gradual clearing, with a high near 62. South wind 10 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Mostly cloudy, with a low around 41. Light south wind.
Thursday
Mostly sunny, with a high near 71. South wind 3 to 7 mph.
Thursday Night
Mostly clear, with a low around 47.
Friday
Mostly sunny, with a high near 74.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 53.
Sunday
Mostly sunny, with a high near 73.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Trenton IL
 38.6°N 89.66°W (Elev. 456 ft)
Last Update:
3:31 am CDT Mar 17, 2026
Forecast Valid:
5am CDT Mar 17, 2026-6pm CDT Mar 23, 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