Blackwells Mills, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Blackwells Mills, a community in Somerset County, New Jersey.
This Afternoon
73°F
Mostly Sunny
Mostly sunny, with a high near 73. East wind around 5 mph.
7-day forecast for Blackwells Mills
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 73°F | Mostly Sunny | 5 mph E | 1% |
| Tonight | 56°F | Mostly Cloudy | 0 to 5 mph SE | 7% |
| Sunday | 73°F | Rain Showers | 5 mph SE | 87% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely | 0 to 5 mph W | 69% |
| Monday | 68°F | Chance Rain Showers | 5 to 10 mph NE | 36% |
| Monday Night | 49°F | Chance Rain Showers | 5 to 10 mph NE | 27% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 32% |
| Tuesday Night | 48°F | Chance Rain Showers | 10 mph NE | 30% |
| Wednesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 24% |
| Wednesday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 32% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 10 mph NE | 34% |
| Friday | 65°F | Chance Rain Showers | 10 mph N | 32% |
| Friday Night | 48°F | Chance Rain Showers | 5 to 10 mph N | 29% |
Forecast source: National Weather Service (api.weather.gov) for Blackwells Mills (40.481, -74.598). Updated through the day.
Growing snapshot for Blackwells Mills
Last spring frost
Apr 15
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
7a
More local growing data for Blackwells Mills: nearby ZIP 08823 weather · frost dates · planting calendar · New Jersey frost dates
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Neshanic
Climate data from the nearest NOAA station, New Brunswick 3 Se, Nj (7.9 mi from Blackwells Mills). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.