Mercerville, NJ Weather & Growing Conditions
This Afternoon
75°F
Partly Sunny
Partly sunny, with a high near 75. East wind around 5 mph.
7-day forecast
| 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). Updated through the day.
Growing snapshot for Mercerville, NJ
Last spring frost
Apr 17
First fall frost
Oct 28
Growing season
192 days
Hardiness zone
7a
Explore more for Mercerville, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, Trenton State College, Nj (5.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.