Princeton, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Princeton, a community in Mercer County, New Jersey.
This Afternoon
74°F
Mostly Cloudy
Mostly cloudy, with a high near 74. East wind around 5 mph.
7-day forecast for Princeton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Cloudy | 5 mph E | 1% |
| Tonight | 59°F | Mostly Cloudy | 0 to 5 mph E | 6% |
| Sunday | 75°F | Showers And Thunderstorms | 5 mph SE | 79% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 5 mph W | 63% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Monday Night | 52°F | Chance Rain Showers | 5 mph NE | 29% |
| Tuesday | 65°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 | 64°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Wednesday Night | 51°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Thursday | 63°F | Chance Rain Showers | 10 mph NE | 29% |
| Thursday Night | 50°F | Chance Rain Showers | 10 mph NE | 35% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 36% |
| Friday Night | 50°F | Chance Rain Showers | 5 to 10 mph N | 36% |
Forecast source: National Weather Service (api.weather.gov) for Princeton (40.358, -74.667). Updated through the day.
Growing snapshot for Princeton
Last spring frost
Apr 25
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
7a
More local growing data for Princeton: nearby ZIP 08542 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Allentown
Groveville
Hamilton Square
Hightstown
Hopewell
Lawrenceville
Mercerville
Pennington
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 (7.9 mi from Princeton). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.