Hamilton Square, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hamilton Square, a community in Mercer County, New Jersey.
This Afternoon
74°F
Partly Sunny
Partly sunny, with a high near 74. East wind around 5 mph.
7-day forecast for Hamilton Square
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Partly Sunny | 5 mph E | 1% |
| Tonight | 57°F | Mostly Cloudy | 0 to 5 mph E | 3% |
| Sunday | 75°F | Rain Showers Likely | 5 to 10 mph SE | 71% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely | 5 to 10 mph W | 72% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 47% |
| Monday Night | 51°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 64°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday Night | 50°F | Chance Rain Showers | 10 to 15 mph NE | 36% |
| Wednesday | 64°F | Chance Rain Showers | 15 mph NE | 26% |
| Wednesday Night | 50°F | Chance Rain Showers | 15 mph NE | 32% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Thursday Night | 49°F | Chance Rain Showers | 10 mph N | 34% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 33% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 28% |
Forecast source: National Weather Service (api.weather.gov) for Hamilton Square (40.225, -74.650). Updated through the day.
Growing snapshot for Hamilton Square
Last spring frost
Apr 25
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
7a
More local growing data for Hamilton Square: nearby ZIP 08690 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Allentown
Groveville
Hightstown
Hopewell
Lawrenceville
Mercerville
Pennington
Princeton
Robbinsville Center
The College of New Jersey
Titusville
Trenton
Twin Rivers
White Horse
Windsor
Yardville
Climate data from the nearest NOAA station, Hightstown 2 W, Nj (5.8 mi from Hamilton Square). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.