All Countries
South River, NJ
Full City Profile · New Jersey · Middlesex County County
3.3
/5.0
B
Good
16,007
Population
5,737/sq mi density
$101,853
Median Income
$42,195 per capita
$382,500
Home Value
$520,132 Zillow
$1,599
Median Rent
31.3% income on rent
54°F
Avg Temperature
275 sunny days/yr
220
Violent Crime/100K
640 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$101,853 median income, 6.3% unemployment
A+
Affordability
4.6 / 5.0
$382,500 home value, $1,599/mo rent
F
Safety
1.0 / 5.0
220 violent crimes/100K
B
Education
3.5 / 5.0
31.1% bachelor's degree or higher
South River experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 32°F in January while summers reach 76°F in July. The area gets 275 sunny days per year. Annual precipitation totals 49.5 inches. The area receives 29.0 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
32°F Jan (-0°C)
76°F Jul (25°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 32°F (-0°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 22 ft (7 m) |
| Area | 2.9 sq mi (7.6 km²) |
| Population Density | 5,737/sq mi |
| Coordinates | 40.4457°N, 74.3785°W |
| Timezone | America/New_York |
| County | Middlesex County County |
| Nearest Airport | Central Jersey Regional (JVI) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0452 ppm |
| NO₂ (Nitrogen Dioxide) | 12.7 ppb |
| PM2.5 (Fine Particles) | 8.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.8 / 100 |
| Social Vulnerability | 47.4 / 100 |
| Community Resilience | 45.5 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively Moderate |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | - | 115 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | - | - | 49 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 100 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (-0°C) | 3.8 in | Coldest |
| February | 33°F (0°C) | 3.0 in | Driest |
| March | 41°F (5°C) | 4.1 in | |
| April | 51°F (10°C) | 4.1 in | |
| May | 61°F (16°C) | 4.4 in | |
| June | 70°F (21°C) | 3.9 in | |
| July | 76°F (25°C) | 4.9 in | Warmest, Wettest |
| August | 73°F (23°C) | 4.5 in | |
| September | 66°F (19°C) | 4.2 in | |
| October | 55°F (13°C) | 3.5 in | |
| November | 45°F (7°C) | 4.0 in | |
| December | 36°F (2°C) | 3.8 in |
South River has a seasonal temperature swing of 45°F / from 32°F in January to 76°F in July. Total annual precipitation is 48.0 inches, with July being the wettest month (4.9") and February the driest (3.0").