Mercerville, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercerville, a community in Mercer County, New Jersey.
This Afternoon
75°F
Partly Sunny
Partly sunny, with a high near 75. East wind around 5 mph.
7-day forecast for Mercerville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Partly Sunny | 5 mph E | 1% |
| Tonight | 58°F | Mostly Cloudy | 0 to 5 mph E | 4% |
| Sunday | 75°F | Rain Showers Likely | 5 mph S | 73% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 71% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 46% |
| Monday Night | 52°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday Night | 51°F | Chance Rain Showers | 10 mph NE | 36% |
| Wednesday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 26% |
| Wednesday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Thursday Night | 50°F | Chance Rain Showers | 10 mph N | 34% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 32% |
| Friday Night | 50°F | Chance Rain Showers | 5 to 10 mph N | 28% |
Forecast source: National Weather Service (api.weather.gov) for Mercerville (40.236, -74.692). Updated through the day.
Growing snapshot for Mercerville
Last spring frost
Apr 17
First fall frost
Oct 28
Growing season
192 days
Hardiness zone
7a
More local growing data for Mercerville: nearby ZIP 08619 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
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Hamilton Square
Hightstown
Hopewell
Lawrenceville
Pennington
Princeton
Robbinsville Center
The College of New Jersey
Titusville
Trenton
Twin Rivers
White Horse
Windsor
Yardville
Climate data from the nearest NOAA station, Trenton State College, Nj (5.4 mi from Mercerville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.