Jamesburg, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jamesburg, a borough in Middlesex County, New Jersey.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Northeast wind around 0 mph.
7-day forecast for Jamesburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 0 mph | 0% |
| Tonight | 64°F | Mostly Cloudy | 0 mph | 2% |
| Wednesday | 84°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 51% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 46% |
| Thursday | 89°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph SW | 32% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 32% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 42% |
| Friday Night | 71°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 | 37% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 37% |
| Sunday | 88°F | Mostly Sunny | 0 to 5 mph W | 14% |
| Sunday Night | 71°F | Mostly Clear | 0 to 5 mph SW | 14% |
| Monday | 90°F | Sunny | 5 mph W | 8% |
| Monday Night | 71°F | Partly Cloudy | 5 mph W | 13% |
Forecast source: National Weather Service (api.weather.gov) for Jamesburg (40.349, -74.440). Updated through the day.
Growing snapshot for Jamesburg
Last spring frost
Apr 25
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
7a
More local growing data for Jamesburg: nearby ZIP 08831 weather · frost dates · planting calendar · New Jersey frost dates
Nearby towns & communities
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Highland Park
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Keasbey
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Metuchen
Middlesex
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New Brunswick
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Perth Amboy
Climate data from the nearest NOAA station, Hightstown 2 W, Nj (8.4 mi from Jamesburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.