Stewartsville, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Stewartsville, a community in Warren County, New Jersey.
Tonight
58°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 1am. Mostly cloudy, with a low around 58. Southeast wind 0 to 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Stewartsville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy then Chance Rain Showers | 0 to 5 mph SE | 48% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 96% |
| Sunday Night | 56°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph N | 88% |
| Monday | 70°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 | 50°F | Chance Rain Showers | 5 to 10 mph N | 33% |
| Saturday | 69°F | Chance Rain Showers | 10 mph N | 29% |
Forecast source: National Weather Service (api.weather.gov) for Stewartsville (40.689, -75.102). Updated through the day.
Growing snapshot for Stewartsville
Last spring frost
Apr 18
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
7a
More local growing data for Stewartsville: nearby ZIP 08886 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Phillipsburg-Easton Brg, Nj (5.2 mi from Stewartsville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.