South River, NJ Weather & Growing Conditions
Tonight
59°F
Mostly Cloudy
Mostly cloudy, with a low around 59. Southeast wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 59°F | Mostly Cloudy | 0 to 5 mph SE | 5% |
| Sunday | 75°F | Showers And Thunderstorms | 5 mph SE | 77% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 5 mph W | 70% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Monday Night | 54°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 33% |
| Tuesday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 10 mph NE | 33% |
| Wednesday | 65°F | Slight Chance Rain Showers | 10 to 15 mph NE | 20% |
| Wednesday Night | 52°F | Slight Chance Rain Showers | 10 to 15 mph NE | 22% |
| Thursday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 30% |
| Thursday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 36% |
| Friday | 66°F | Chance Rain Showers | 10 to 15 mph N | 37% |
| Friday Night | 52°F | Chance Rain Showers | 10 mph N | 37% |
| Saturday | 70°F | Chance Rain Showers | 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for South River, NJ
Last spring frost
Apr 15
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
7a
Explore more for South River, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, New Brunswick 3 Se, Nj (3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.