Mountainside, NJ Weather & Growing Conditions
Tonight
57°F
Partly Cloudy
Partly cloudy, with a low around 57. North wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Partly Cloudy | 9 mph N | 0% |
| Saturday | 71°F | Partly Sunny | 6 to 9 mph E | 0% |
| Saturday Night | 60°F | Mostly Cloudy then Chance Rain Showers | 7 mph SE | 27% |
| Sunday | 70°F | Showers And Thunderstorms | 6 to 9 mph S | 84% |
| Sunday Night | 59°F | Showers And Thunderstorms | 3 to 10 mph NW | 84% |
| Monday | 66°F | Chance Rain Showers | 8 to 12 mph NE | 41% |
| Monday Night | 54°F | Chance Rain Showers | 8 to 12 mph NE | 34% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 14 mph NE | 30% |
| Tuesday Night | 52°F | Chance Rain Showers | 10 to 14 mph NE | 30% |
| Wednesday | 61°F | Chance Rain Showers | 15 mph NE | 25% |
| Wednesday Night | 52°F | Chance Rain Showers | 15 mph NE | 40% |
| Thursday | 61°F | Chance Rain Showers | 12 to 16 mph NE | 34% |
| Thursday Night | 52°F | Chance Showers And Thunderstorms | 12 mph NE | 34% |
| Friday | 67°F | Chance Rain Showers | 12 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mountainside, NJ
Last spring frost
Apr 11
First fall frost
Oct 31
Growing season
202 days
Hardiness zone
7a
Explore more for Mountainside, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, Cranford, Nj (2.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.