Lebanon, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lebanon, a borough in Hunterdon County, New Jersey.
Tonight
57°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly cloudy, with a low around 57. East wind 0 to 5 mph. Chance of precipitation is 20%.
7-day forecast for Lebanon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph E | 19% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 93% |
| Sunday Night | 55°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph NW | 85% |
| Monday | 69°F | Partly Sunny then Slight Chance Rain Showers | 5 mph NE | 24% |
| Monday Night | 50°F | Chance Rain Showers | 0 to 5 mph NE | 30% |
| Tuesday | 64°F | Chance Rain Showers | 5 to 10 mph NE | 35% |
| Tuesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 34% |
| Wednesday | 63°F | Slight Chance Rain Showers | 10 mph NE | 19% |
| Wednesday Night | 49°F | Slight Chance Rain Showers | 5 to 15 mph NE | 21% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 25% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 10 mph NE | 32% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 34% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 34% |
| Saturday | 69°F | Chance Rain Showers | 5 to 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for Lebanon (40.642, -74.833). Updated through the day.
Growing snapshot for Lebanon
Last spring frost
Apr 24
First fall frost
Oct 21
Growing season
179 days
Hardiness zone
7a
More local growing data for Lebanon: nearby ZIP 08833 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Annandale
Asbury
Bloomsbury
Califon
Clinton
Flemington
Frenchtown
Glen Gardner
Hampton
High Bridge
Lambertville
Milford
Oldwick
Pottersville
Ringoes
Stockton
Three Bridges
White House Station
Climate data from the nearest NOAA station, Flemington 5 Nnw, Nj (6 mi from Lebanon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.