Pennington, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pennington, a borough in Mercer County, New Jersey.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 0 mph.
7-day forecast for Pennington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 64°F | Mostly Cloudy | 0 mph | 2% |
| Wednesday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 49% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph S | 70% |
| Thursday | 89°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 10 mph SW | 29% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 44% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 47% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Sunday | 88°F | Mostly Sunny | 0 to 5 mph W | 14% |
| Sunday Night | 70°F | Mostly Clear | 0 to 5 mph W | 14% |
| Monday | 90°F | Sunny | 0 to 10 mph W | 10% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms | 5 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Pennington (40.325, -74.789). Updated through the day.
Growing snapshot for Pennington
Last spring frost
Apr 10
First fall frost
Nov 1
Growing season
202 days
Hardiness zone
7a
More local growing data for Pennington: nearby ZIP 08534 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Allentown
Groveville
Hamilton Square
Hightstown
Hopewell
Lawrenceville
Mercerville
Princeton
Robbinsville Center
The College of New Jersey
Titusville
Trenton
Twin Rivers
White Horse
Windsor
Yardville
Climate data from the nearest NOAA station, Trenton Mercer Co Ap, Nj (3.8 mi from Pennington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.