Trenton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Trenton, a city in Clinton County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. Southeast wind around 5 mph.
7-day forecast for Trenton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 5 mph SE | 0% |
| Tonight | 66°F | Mostly Clear | 1 to 5 mph SE | 0% |
| Wednesday | 89°F | Sunny | 0 to 5 mph S | 5% |
| Wednesday Night | 71°F | Mostly Cloudy then Showers And Thunderstorms Likely | 6 mph S | 59% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 6 mph SW | 72% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 48% |
| Friday | 86°F | Chance Showers And Thunderstorms | 2 mph SW | 48% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 36% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 3 mph S | 36% |
| Saturday Night | 72°F | Partly Cloudy | 5 mph S | 10% |
| Sunday | 90°F | Sunny | 3 to 8 mph S | 7% |
| Sunday Night | 74°F | Mostly Clear | 6 to 9 mph S | 4% |
| Monday | 92°F | Mostly Sunny | 5 to 9 mph S | 4% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 8 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov) for Trenton (38.608, -89.685). Updated through the day.
Growing snapshot for Trenton
Last spring frost
Apr 12
First fall frost
Oct 20
Growing season
189 days
Hardiness zone
6b
More local growing data for Trenton: nearby ZIP 62293 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Albers
Aviston
Bartelso
Beckemeyer
Breese
Carlyle
Damiansville
Germantown
Hoffman
Huey
New Baden
St. Rose
Climate data from the nearest NOAA station, Belleville Siu Rsch, Il (10.5 mi from Trenton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.