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Harbor Island, SC
Full City Profile · South Carolina · Beaufort County County
4.0
/5.0
A
Great
310
Population
304/sq mi density
$100,250
Median Income
$41,638 per capita
$284,500
Home Value
$717,792 Zillow
66°F
Avg Temperature
323 sunny days/yr
483
Violent Crime/100K
18,841 property/100K
A
Overall
4.0 / 5.0
Strong
A+
Economy
5.0 / 5.0
$100,250 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$284,500 home value, /mo rent
F
Safety
1.0 / 5.0
483 violent crimes/100K (27% above avg)
A+
Education
5.0 / 5.0
80.8% bachelor's degree or higher
Harbor Island enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 48°F in January while summers reach 82°F in July. The area gets 323 sunny days per year. Air quality is rated Good with a median AQI of 43.
Temperature
48°F Jan (9°C)
82°F Jul (28°C)
| Annual Average | 65.5°F |
| 21% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 323 days/yr |
Geography
| Elevation | 2 ft (1 m) |
| Area | 1.5 sq mi (3.9 km²) |
| Population Density | 304/sq mi |
| Coordinates | 32.4083°N, 80.4382°W |
| Timezone | America/New_York |
| County | Beaufort County County |
| Nearest Airport | Lowcountry Regional (RBW) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.1 / 100 |
| Social Vulnerability | 44.6 / 100 |
| Community Resilience | 66.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1886 | CHARLESTON, SC | Earthquake | — | — | 68 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 3.7 in | Coldest |
| February | 51°F (11°C) | 3.2 in | |
| March | 58°F (15°C) | 4.1 in | |
| April | 64°F (18°C) | 2.9 in | |
| May | 72°F (22°C) | 3.5 in | |
| June | 78°F (25°C) | 5.4 in | |
| July | 82°F (28°C) | 5.9 in | Warmest |
| August | 80°F (27°C) | 7.4 in | Wettest |
| September | 77°F (25°C) | 5.1 in | |
| October | 68°F (20°C) | 2.9 in | |
| November | 59°F (15°C) | 2.6 in | Driest |
| December | 52°F (11°C) | 3.2 in |
Harbor Island has a seasonal temperature swing of 33°F / from 48°F in January to 82°F in July. Total annual precipitation is 49.9 inches, with August being the wettest month (7.4") and November the driest (2.6").