Trenton, IL Weather & Growing Conditions
Tonight
57°F
Rain
Rain and a slight chance of thunderstorms before 4am, then a slight chance of drizzle between 4am and 5am, then a slight chance of rain. Cloudy, with a low around 57. South wind 7 to 15 mph, with gusts as high as 32 mph. Chance of precipitation is 100%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Rain | 7 to 15 mph S | 97% |
| Wednesday | 64°F | Slight Chance Drizzle then Mostly Cloudy | 7 to 15 mph W | 12% |
| Wednesday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 12 mph W | 0% |
| Thursday Night | 44°F | Mostly Cloudy | 3 mph NW | 5% |
| Friday | 59°F | Mostly Cloudy | 5 to 12 mph NW | 7% |
| Friday Night | 38°F | Partly Cloudy | 2 to 6 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 0% |
| Sunday | 61°F | Sunny | 1 to 7 mph W | 7% |
| Sunday Night | 35°F | Mostly Clear | 3 mph NW | 5% |
| Monday | 66°F | Sunny | 1 to 8 mph W | 2% |
| Monday Night | 40°F | Mostly Clear | 3 mph SW | 1% |
| Tuesday | 69°F | Sunny | 2 to 6 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Trenton, IL
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
Explore more for Trenton, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (10.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.