Greenwich, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Greenwich, a community in Warren County, New Jersey.
This Afternoon
72°F
Partly Sunny
Partly sunny, with a high near 72. Southeast wind around 0 mph.
7-day forecast for Greenwich
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Partly Sunny | 0 mph | 1% |
| Tonight | 57°F | Mostly Cloudy then Chance Rain Showers | 0 to 5 mph SE | 51% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 96% |
| Sunday Night | 56°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph N | 87% |
| Monday | 69°F | Partly Sunny then Slight Chance Rain Showers | 5 to 10 mph NE | 23% |
| Monday Night | 50°F | Chance Rain Showers | 5 mph NE | 31% |
| Tuesday | 64°F | Chance Rain Showers | 5 to 10 mph NE | 37% |
| Tuesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 34% |
| Wednesday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Wednesday Night | 48°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Thursday | 62°F | Slight Chance Rain Showers | 10 mph NE | 24% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 33% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 33% |
Forecast source: National Weather Service (api.weather.gov) for Greenwich (40.685, -75.134). Updated through the day.
Growing snapshot for Greenwich
Last spring frost
Apr 18
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
7a
More local growing data for Greenwich: nearby ZIP 08865 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Phillipsburg-Easton Brg, Nj (2.9 mi from Greenwich). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.