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.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind 0 to 5 mph.
7-day forecast for South Plainfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Tonight | 65°F | Mostly Cloudy | 0 to 5 mph NE | 1% |
| Wednesday | 83°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 46% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 37% |
| Thursday | 90°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 38% |
| Thursday Night | 73°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 40% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 44% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 44% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 15% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 5 mph W | 15% |
| Monday | 90°F | Mostly Sunny | 0 to 10 mph W | 9% |
| Monday Night | 71°F | Partly Cloudy | 5 to 10 mph W | 12% |
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
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Cranbury
Dayton
Deans
East Franklin
Encore at Monroe
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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 Aug 4, 2026.