New Jersey weather in September: Statewide normals and every place, NOAA 1991-2020
In September, New Jersey's statewide normal high is 77°F and normal low 57°F; normal highs run from 74°F in Andover to 80°F in Belleplain (NOAA 1991-2020 normals).
- Statewide normal high
- 77°FSeptember, 1991-2020
- Statewide normal low
- 57°FSeptember, 1991-2020
- Statewide normal precipitation
- 4.16 inSeptember
- Warmest place
- 80°Fnormal high, Belleplain
- Coolest place
- 74°Fnormal high, Andover
Where is New Jersey warmest and wettest in September?
Belleplain has the warmest September afternoons (80°F) and Andover the coolest (74°F). Phillipsburg gets the most precipitation (4.72 in) and Millville the least (3.15 in).
Statewide, September averaged 68.7°F in 2021, 67.6°F in 2022, 68.0°F in 2023, 66.8°F in 2024, 68.0°F in 2025, against a 1991-2020 normal of 66.9°F.
| Place | High | Low | Precip. | Snow |
|---|---|---|---|---|
| Newark | 78°F | 61°F | 3.82 | 0.0 |
| Toms River | 77°F | 53°F | 4.68 | – |
| Trenton | 77°F | 58°F | 4.05 | 0.0 |
| New Brunswick | 78°F | 57°F | 4.18 | 0.0 |
| Plainfield | 79°F | 58°F | 4.27 | 0.0 |
| Atlantic City | 79°F | 58°F | 3.55 | 0.0 |
| Long Branch | 76°F | 59°F | 4.33 | – |
| Millville | 78°F | 57°F | 3.15 | – |
| Glassboro | 79°F | 60°F | – | – |
| Harrison | 78°F | 60°F | 4.33 | 0.0 |
| Phillipsburg | 77°F | 55°F | 4.72 | – |
| Hammonton | 79°F | 57°F | 4.06 | 0.0 |
| Moorestown-Lenola | 80°F | 59°F | 4.25 | – |
| Somerville | 78°F | 54°F | 3.82 | – |
| Freehold | 78°F | 56°F | 4.19 | – |
| Wanaque | 76°F | 56°F | 3.95 | – |
| Caldwell | 76°F | 57°F | 3.72 | – |
| Boonton | 77°F | 54°F | 4.68 | – |
| Newton | 75°F | 52°F | – | – |
| Hightstown | 78°F | 54°F | 4.15 | 0.0 |
| Flemington | 77°F | 54°F | 4.39 | 0.0 |
| Lambertville | 80°F | 54°F | 4.44 | 0.0 |
| Woodstown | 80°F | 58°F | 4.21 | 0.0 |
| Cape May | 79°F | 62°F | 3.76 | 0.0 |
| Belvidere | 76°F | 52°F | 4.63 | 0.0 |
| Essex Fells | 78°F | 54°F | 4.53 | – |
| Sussex | 75°F | 51°F | 3.83 | – |
| Cranford | 77°F | 59°F | 4.25 | 0.0 |
| Estell Manor | 79°F | 57°F | 3.93 | 0.0 |
| Seabrook Farms | 78°F | 59°F | 4.25 | 0.0 |
| Belleplain | 80°F | 58°F | – | – |
| Andover | 74°F | 52°F | 4.32 | – |
| Teterboro | 78°F | 60°F | 4.11 | – |
| Brant Beach-Beach Haven | 77°F | 63°F | 3.34 | 0.0 |
| Canoe Brook | 78°F | 56°F | 4.64 | 0.0 |
| Charlotteburg Reservoir | 75°F | 52°F | 4.88 | – |
| Indian Mills (2 mi W) | 78°F | 55°F | 4.44 | 0.0 |
| Little Falls | 76°F | 56°F | – | – |
| Margate | 78°F | 64°F | – | – |
| Mount Holly S Jersey Airport | 78°F | 57°F | 3.39 | – |
| Pennsauken (1 mi N) | 78°F | 59°F | 4.32 | – |
| Philadelphia/Mount Holly Weather Office | 76°F | 57°F | 3.65 | 0.0 |
| Wertsville (4 mi NE) | 77°F | 55°F | 4.48 | 0.0 |
Source: NOAA NCEI nClimDiv statewide normals; NOAA NCEI 1991-2020 monthly normals for each station.