South Plainfield, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Plainfield, a borough in Middlesex County, New Jersey.
Tonight
60°F
Mostly Cloudy
Mostly cloudy, with a low around 60. Southeast wind 0 to 5 mph.
7-day forecast for South Plainfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Mostly Cloudy | 0 to 5 mph SE | 8% |
| Sunday | 74°F | Rain Showers | 5 mph SE | 84% |
| Sunday Night | 58°F | Showers And Thunderstorms | 0 to 5 mph W | 76% |
| Monday | 69°F | Chance Rain Showers | 5 to 10 mph NE | 26% |
| Monday Night | 54°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Tuesday | 65°F | Chance Rain Showers | 10 mph NE | 32% |
| Tuesday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 32% |
| Wednesday | 65°F | Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Wednesday Night | 52°F | Slight Chance Rain Showers | 10 mph NE | 21% |
| Thursday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 29% |
| Thursday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 35% |
| Friday | 65°F | Chance Rain Showers | 10 to 15 mph N | 35% |
| Friday Night | 52°F | Chance Rain Showers | 10 mph N | 35% |
| Saturday | 69°F | Chance Rain Showers | 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov) for South Plainfield (40.574, -74.415). Updated through the day.
Growing snapshot for South Plainfield
Last spring frost
Apr 11
First fall frost
Oct 28
Growing season
198 days
Hardiness zone
7a
More local growing data for South Plainfield: nearby ZIP 07080 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
Avenel
Brownville
Carteret
Clearbrook
Colonia
Concordia
Cranbury
Dayton
Deans
East Franklin
Encore at Monroe
Fords
Forsgate
Heathcote
Helmetta
Highland Park
Hopelawn
Iselin
Jamesburg
Keasbey
Kendall Park
Madison Park
Matawan
Menlo Park Terrace
Metuchen
Middlesex
Milltown
Monmouth Junction
New Brunswick
Old Bridge
Climate data from the nearest NOAA station, Plainfield, Nj (2.1 mi from South Plainfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.