Summit, NJ Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a city in Union County, New Jersey.
Overnight
61°F
Partly Cloudy
Partly cloudy. Low around 61, with temperatures rising to around 63 overnight. North wind around 2 mph.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Partly Cloudy | 2 mph N | 0% |
| Tuesday | 83°F | Mostly Sunny | 3 mph NE | 0% |
| Tuesday Night | 65°F | Mostly Cloudy | 3 mph N | 4% |
| Wednesday | 82°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph E | 39% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 5 mph S | 33% |
| Thursday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 8 mph SW | 41% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 to 7 mph SW | 43% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph SW | 45% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 44% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 8 mph W | 38% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 2 to 7 mph W | 38% |
| Sunday | 87°F | Mostly Sunny | 2 to 7 mph W | 12% |
| Sunday Night | 71°F | Mostly Clear | 6 mph SW | 12% |
| Monday | 89°F | Sunny | 3 to 10 mph W | 10% |
Forecast source: National Weather Service (api.weather.gov) for Summit (40.716, -74.365). Updated through the day.
Growing snapshot for Summit
Last spring frost
Apr 18
First fall frost
Oct 27
Growing season
189 days
Hardiness zone
7a
More local growing data for Summit: nearby ZIP 07901 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
Union
Vauxhall
Westfield
Climate data from the nearest NOAA station, Canoe Brook, Nj (2.1 mi from Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.