Mendham, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendham, a borough in Morris County, New Jersey.
This Afternoon
71°F
Mostly Sunny
Mostly sunny, with a high near 71. Southeast wind around 5 mph.
7-day forecast for Mendham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 71°F | Mostly Sunny | 5 mph SE | 1% |
| Tonight | 55°F | Mostly Cloudy | 0 to 5 mph SE | 9% |
| Sunday | 69°F | Rain Showers | 5 mph SE | 96% |
| Sunday Night | 54°F | Showers And Thunderstorms Likely | 0 to 10 mph W | 68% |
| Monday | 66°F | Chance Rain Showers then Partly Sunny | 5 to 10 mph NE | 25% |
| Monday Night | 49°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph NE | 25% |
| Tuesday | 61°F | Chance Rain Showers | 10 mph NE | 30% |
| Tuesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 25% |
| Wednesday | 61°F | Slight Chance Rain Showers | 10 to 15 mph NE | 22% |
| Wednesday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Thursday | 60°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 10 mph N | 35% |
| Friday | 63°F | Chance Rain Showers | 10 mph N | 30% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 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 19, 2026.