Cedar Knolls, NJ Weather & Growing Conditions
Tonight
58°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 4am. Mostly cloudy, with a low around 58. East wind 0 to 5 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph E | 22% |
| Sunday | 71°F | Rain Showers | 5 mph SE | 93% |
| Sunday Night | 56°F | Showers And Thunderstorms | 0 to 10 mph NW | 86% |
| Monday | 68°F | Slight Chance Rain Showers | 5 to 10 mph NE | 22% |
| Monday Night | 51°F | Chance Rain Showers | 5 to 10 mph NE | 30% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 30% |
| Tuesday Night | 49°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 29% |
| Wednesday | 63°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph NE | 18% |
| Wednesday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Thursday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Thursday Night | 49°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Friday | 64°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Friday Night | 51°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Saturday | 67°F | Chance Rain Showers | 10 to 15 mph N | 31% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cedar Knolls, NJ
Last spring frost
Apr 17
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
7a
Explore more for Cedar Knolls, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, Boonton 1 Se, Nj (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.