Mendham, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendham, a borough in Morris County, New Jersey.
Tonight
57°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 57. Southeast wind 0 to 5 mph. Chance of precipitation is 20%.
7-day forecast for Mendham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 21% |
| Sunday | 70°F | Rain Showers | 5 mph SE | 92% |
| Sunday Night | 55°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 10 mph NW | 85% |
| Monday | 67°F | Partly Sunny then Slight Chance Rain Showers | 5 to 10 mph NE | 23% |
| Monday Night | 50°F | Chance Rain Showers | 5 mph NE | 30% |
| Tuesday | 62°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 31% |
| Wednesday | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Wednesday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Thursday | 61°F | Chance Rain Showers | 10 to 15 mph NE | 27% |
| Thursday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Friday | 63°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Friday Night | 50°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Saturday | 67°F | Chance Rain Showers | 10 to 15 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for Mendham (40.767, -74.598). Updated through the day.
Growing snapshot for Mendham
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
6b
More local growing data for Mendham: nearby ZIP 07945 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Beattystown
Boonton
Brookside
Budd Lake
Cedar Knolls
Chester
Dover
Flanders
Florham Park
Gillette
Green Village
Hibernia
Kenvil
Kinnelon
Lake Hiawatha
Lake Hopatcong
Lake Telemark
Landing
Ledgewood
Lincoln Park
Long Valley
Lower Berkshire Valley
Macopin
Madison
Millington
Morris Plains
Morristown
Mount Arlington
Mount Hope
Mount Tabor
Climate data from the nearest NOAA station, Somerville Somerset Ap, Nj (11.4 mi from Mendham). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.