Trenton, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Trenton, a city in Clinton County, Illinois.
This Afternoon
96°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 96. Heat index values as high as 106. East wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for Trenton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 96°F | Chance Showers And Thunderstorms | 2 mph E | 26% |
| Tonight | 72°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph SE | 24% |
| Saturday | 97°F | Mostly Sunny | 2 to 7 mph SW | 6% |
| Saturday Night | 73°F | Partly Cloudy | 5 mph S | 1% |
| Sunday | 93°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph W | 17% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 7 mph N | 53% |
| Monday | 81°F | Showers And Thunderstorms Likely | 6 to 12 mph N | 64% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 6 to 12 mph NE | 64% |
| Tuesday | 72°F | Chance Rain Showers then Partly Sunny | 9 to 13 mph N | 27% |
| Tuesday Night | 55°F | Mostly Cloudy | 5 to 13 mph N | 6% |
| Wednesday | 74°F | Mostly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 55°F | Partly Cloudy | 2 to 8 mph N | 2% |
| Thursday | 75°F | Mostly Sunny | 2 to 8 mph N | 1% |
| Thursday Night | 58°F | Partly Cloudy | 2 to 7 mph N | 2% |
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 Sep 18, 2026.