Mendham, NJ Weather & Growing Conditions
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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 23% |
| Sunday | 70°F | Rain Showers | 5 mph SE | 93% |
| 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 | 51°F | Chance Rain Showers | 5 to 10 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 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 | 64°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). Updated through the day.
Growing snapshot for Mendham, NJ
Last spring frost
Apr 26
First fall frost
Oct 18
Growing season
176 days
Hardiness zone
6b
Explore more for Mendham, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, Somerville Somerset Ap, Nj (11.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.