Williamstown, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamstown, a community in Gloucester County, New Jersey.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind 0 to 5 mph.
7-day forecast for Williamstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy | 0 to 5 mph E | 10% |
| Wednesday | 84°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SE | 69% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 5 mph S | 48% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| Thursday Night | 73°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 21% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 33% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 41% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 37% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 37% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 19% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 19% |
| Monday | 90°F | Sunny | 0 to 5 mph SW | 6% |
| Monday Night | 72°F | Partly Cloudy | 5 mph W | 10% |
Forecast source: National Weather Service (api.weather.gov) for Williamstown (39.684, -74.969). Updated through the day.
Growing snapshot for Williamstown
Last spring frost
Apr 14
First fall frost
Oct 27
Growing season
196 days
Hardiness zone
7a
More local growing data for Williamstown: nearby ZIP 08094 weather · frost dates · planting calendar · New Jersey frost dates
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Climate data from the nearest NOAA station, Hammonton 1 Ne, Nj (8.2 mi from Williamstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.