Trenton, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Trenton, a city in Mercer County, New Jersey.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 0 mph.
7-day forecast for Trenton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 66°F | Mostly Cloudy | 0 mph | 3% |
| Wednesday | 85°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph E | 54% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph S | 68% |
| Thursday | 90°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 10 mph SW | 26% |
| Thursday Night | 73°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 30% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 42% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 47% |
| Saturday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Sunday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 15% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 15% |
| Monday | 91°F | Sunny | 0 to 10 mph W | 10% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Trenton (40.224, -74.764). Updated through the day.
Growing snapshot for Trenton
Last spring frost
Apr 17
First fall frost
Oct 28
Growing season
192 days
More local growing data for Trenton: nearby ZIP 08608 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Allentown
Groveville
Hamilton Square
Hightstown
Hopewell
Lawrenceville
Mercerville
Pennington
Princeton
Robbinsville Center
The College of New Jersey
Titusville
Twin Rivers
White Horse
Windsor
Yardville
Climate data from the nearest NOAA station, Trenton State College, Nj (3.8 mi from Trenton). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.