Allentown, NJ Weather & Growing Conditions
Tonight
58°F
Mostly Cloudy
Mostly cloudy, with a low around 58. East wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Mostly Cloudy | 0 to 5 mph E | 4% |
| Sunday | 77°F | Rain Showers Likely | 5 to 10 mph SE | 56% |
| Sunday Night | 58°F | Rain Showers Likely | 5 to 10 mph W | 70% |
| Monday | 70°F | Partly Sunny then Chance Rain Showers | 5 to 10 mph NE | 31% |
| Monday Night | 53°F | Chance Rain Showers | 5 to 10 mph NE | 31% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 35% |
| Tuesday Night | 52°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 34% |
| Wednesday | 65°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Wednesday Night | 52°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Thursday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 31% |
| Thursday Night | 50°F | Chance Rain Showers | 10 to 15 mph NE | 38% |
| Friday | 66°F | Chance Rain Showers | 10 to 15 mph N | 37% |
| Friday Night | 50°F | Chance Rain Showers | 10 mph N | 37% |
| Saturday | 70°F | Chance Rain Showers | 10 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Allentown, NJ
Last spring frost
Apr 25
First fall frost
Oct 16
Growing season
173 days
Hardiness zone
7a
Explore more for Allentown, NJ: full frost dates · planting calendar · New Jersey frost dates
Climate data from the nearest NOAA station, Hightstown 2 W, Nj (6.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.