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

75°F

24°C

Humidity 100%
Wind Speed Calm
Barometer 29.98 in (1014.7 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Last update 22 Jul 12:53 am CDT
Extended Forecast for

Trenton IL

Heat Advisory July 22, 12:00pm until July 24, 07:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: A slight chance of showers and thunderstorms between 3am and 4am. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 105. Southeast wind 3 to 7 mph.

    High: 91 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 76. Southeast wind 3 to 6 mph.

    Low: 76 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 94. Heat index values as high as 108. South wind 3 to 6 mph.

    High: 94 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 76. South wind 3 to 5 mph.

    Low: 76 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.

    Low: 75 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
A slight chance of showers and thunderstorms between 3am and 4am. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 20%.
Tuesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 105. Southeast wind 3 to 7 mph.
Tuesday Night
Partly cloudy, with a low around 76. Southeast wind 3 to 6 mph.
Wednesday
Sunny, with a high near 94. Heat index values as high as 108. South wind 3 to 6 mph.
Wednesday Night
Mostly clear, with a low around 76. South wind 3 to 5 mph.
Thursday
Sunny, with a high near 94.
Thursday Night
Partly cloudy, with a low around 75.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Saturday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 92.
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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:
10:21 pm CDT Jul 21, 2025
Forecast Valid:
1am CDT Jul 22, 2025-6pm CDT Jul 28, 2025
 
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