Union, NJ Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Union, a community in Union County, New Jersey.

This Afternoon

72°F

Partly Sunny

Partly sunny, with a high near 72. Southeast wind around 7 mph.

7-day forecast for Union

When	Temp	Forecast	Wind	Precip
This Afternoon	72°F	Partly Sunny	7 mph SE	1%
Tonight	61°F	Mostly Cloudy then Slight Chance Rain Showers	3 to 7 mph SE	16%
Sunday	73°F	Rain Showers then Rain Likely	6 to 9 mph SE	87%
Sunday Night	59°F	Rain Likely then Rain Showers Likely	5 to 12 mph W	81%
Monday	69°F	Chance Rain Showers	8 to 13 mph NE	25%
Monday Night	55°F	Chance Rain Showers	7 to 10 mph NE	30%
Tuesday	65°F	Chance Rain Showers	12 mph NE	30%
Tuesday Night	53°F	Chance Rain Showers then Mostly Cloudy	13 mph NE	30%
Wednesday	65°F	Mostly Cloudy then Slight Chance Rain Showers	15 mph NE	18%
Wednesday Night	53°F	Slight Chance Rain Showers	15 mph NE	21%
Thursday	64°F	Chance Rain Showers	16 mph NE	29%
Thursday Night	52°F	Chance Rain Showers	16 mph NE	36%
Friday	65°F	Chance Rain Showers	13 to 17 mph N	36%
Friday Night	54°F	Chance Rain Showers	15 mph N	36%

Forecast source: National Weather Service (api.weather.gov) for Union (40.697, -74.269). Updated through the day.

Growing snapshot for Union

Last spring frost

Apr 11

First fall frost

Oct 31

Growing season

202 days

Hardiness zone

More local growing data for Union: nearby ZIP 07083 weather · frost dates · planting calendar · New Jersey frost dates

Nearby towns & communities

Chatham Connecticut Farms Cranford Elizabeth Fanwood Garwood Kean University Kenilworth Linden Mountainside New Providence North Plainfield Plainfield Rahway Roselle Roselle Park Summit Vauxhall Westfield

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Climate data from the nearest NOAA station, Cranford, Nj (3.5 mi from Union). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.