Mendham, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mendham, a borough in Morris County, New Jersey.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. East wind around 0 mph.
7-day forecast for Mendham
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 63°F | Mostly Cloudy | 0 mph | 1% |
| Wednesday | 82°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SE | 44% |
| Wednesday Night | 69°F | Chance Showers And Thunderstorms | 0 mph | 44% |
| Thursday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 54% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 54% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 49% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 49% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 44% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 44% |
| Sunday | 86°F | Mostly Sunny | 0 to 5 mph W | 12% |
| Sunday Night | 70°F | Mostly Clear | 0 to 5 mph W | 12% |
| Monday | 87°F | Mostly Sunny | 0 to 10 mph W | 13% |
| Monday Night | 68°F | Partly Cloudy | 0 to 5 mph W | 13% |
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 Aug 4, 2026.