Mountainside, NJ Weather & Growing Conditions
Today
75°F
Sunny
Sunny. High near 75, with temperatures falling to around 69 in the afternoon. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Sunny | 7 mph SW | 0% |
| Tonight | 57°F | Mostly Cloudy | 5 mph S | 0% |
| Thursday | 72°F | Chance Rain Showers | 6 to 9 mph S | 41% |
| Thursday Night | 60°F | Rain Showers Likely | 6 mph SW | 62% |
| Friday | 69°F | Rain Showers | 3 mph S | 80% |
| Friday Night | 52°F | Chance Rain Showers | 5 mph NW | 48% |
| Saturday | 64°F | Mostly Sunny | 8 mph NW | 13% |
| Saturday Night | 43°F | Slight Chance Light Rain | 8 mph W | 19% |
| Sunday | 59°F | Mostly Sunny | 9 mph W | 9% |
| Sunday Night | 40°F | Partly Cloudy | 8 mph W | 4% |
| Monday | 58°F | Sunny | 8 to 13 mph W | 9% |
| Monday Night | 39°F | Mostly Clear | 8 mph W | 8% |
| Tuesday | 61°F | Sunny | 7 to 12 mph W | 4% |
| Tuesday Night | 39°F | Mostly Clear | 9 mph W | 0% |
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 Nov 4, 2026.