Princeton Junction, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Princeton Junction, a community in Middlesex County, New Jersey.
Tonight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. East wind 0 to 5 mph.
7-day forecast for Princeton Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy | 0 to 5 mph E | 5% |
| Sunday | 76°F | Rain Showers Likely | 5 mph SE | 73% |
| Sunday Night | 57°F | Rain Showers Likely | 0 to 5 mph W | 66% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Monday Night | 52°F | Chance Rain Showers | 5 mph NE | 29% |
| Tuesday | 66°F | Chance Rain Showers | 5 to 10 mph NE | 35% |
| Tuesday Night | 51°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 35% |
| Wednesday | 65°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Wednesday Night | 51°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Thursday | 63°F | Chance Rain Showers | 10 mph NE | 30% |
| Thursday Night | 50°F | Chance Rain Showers | 10 mph NE | 36% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 36% |
| Friday Night | 50°F | Chance Rain Showers | 5 to 10 mph N | 36% |
| Saturday | 70°F | Chance Rain Showers | 5 to 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for Princeton Junction (40.323, -74.622). Updated through the day.
Growing snapshot for Princeton Junction
Last spring frost
Apr 25
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
7a
More local growing data for Princeton Junction: nearby ZIP 08536 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Hightstown 2 W, Nj (4.8 mi from Princeton Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.