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.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. Northeast wind around 0 mph.
7-day forecast for Princeton Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 64°F | Mostly Cloudy | 0 mph | 2% |
| Wednesday | 85°F | Mostly Cloudy then Chance Showers And Thunderstorms | 0 to 5 mph E | 51% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 61% |
| Thursday | 90°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 30% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 32% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 43% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 46% |
| Saturday | 88°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 | 0 to 5 mph W | 14% |
| Sunday Night | 71°F | Mostly Clear | 0 to 5 mph W | 14% |
| Monday | 90°F | Sunny | 0 to 10 mph W | 9% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 15% |
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 Aug 4, 2026.