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Weather & Climate in Harbor Island, SC
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
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, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 2 feet.
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)
Earthquake History
33 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| Aug 21, 1992 | 1 km SSE of Centerville, South Carolina | M4.1 | 69 km | 7 km |
| Apr 17, 1995 | 0 km NNW of Centerville, South Carolina | M3.9 | 70 km | 8 km |
| Nov 13, 1990 | 4 km SSW of Ladson, South Carolina | M3.5 | 66 km | 3 km |
| Nov 8, 2002 | 24 km SSE of Kiawah Island, South Carolina | M3.5 | 46 km | 4 km |
| Aug 29, 2009 | 2 km NE of Summerville, South Carolina | M3.2 | 74 km | 5 km |
| Jul 20, 2004 | 7 km WSW of Centerville, South Carolina | M3.1 | 65 km | 10 km |
| May 5, 2003 | 4 km NNW of Summerville, South Carolina | M3.1 | 76 km | 11 km |
| Mar 29, 1999 | 3 km NNW of Sangaree, South Carolina | M3.0 | 78 km | 11 km |
| Jul 26, 2002 | 4 km NNW of Summerville, South Carolina | M3.0 | 76 km | 10 km |
| Mar 19, 2014 | 0 km WNW of Centerville, South Carolina | M3.0 | 70 km | 7 km |
| Jul 7, 2002 | 1 km NW of Sangaree, South Carolina | M2.9 | 76 km | 11 km |
| Feb 7, 1990 | 9 km S of Centerville, South Carolina | M2.9 | 61 km | 9 km |
| Mar 2, 2003 | 7 km S of Centerville, South Carolina | M2.9 | 64 km | 7 km |
| Jul 16, 2002 | 5 km SSW of Ladson, South Carolina | M2.8 | 65 km | 7 km |
| Jul 31, 2012 | 5 km S of Centerville, South Carolina | M2.8 | 65 km | 8 km |
| May 12, 2010 | 6 km SSW of Ladson, South Carolina | M2.8 | 65 km | 1 km |
| May 1, 2004 | 3 km ENE of Goose Creek, South Carolina | M2.7 | 77 km | 11 km |
| Jan 11, 2002 | 6 km SSW of Ladson, South Carolina | M2.7 | 65 km | 6 km |
| May 11, 1990 | 5 km SSE of Centerville, South Carolina | M2.6 | 66 km | 6 km |
| Jun 12, 2003 | 5 km WSW of Centerville, South Carolina | M2.6 | 67 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
21 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Helene | Category 2 | 109 mph | 297 km |
| 2023 | Idalia | Category 3 | 115 mph | 280 km |
| 2022 | Ian | Category 1 | 86 mph | 130 km |
| 2020 | Isaias | Category 1 | 92 mph | 105 km |
| 2019 | Dorian | Category 3 | 115 mph | 119 km |
| 2018 | Florence | Category 1 | 92 mph | 259 km |
| 2016 | Matthew | Category 3 | 109 mph | 35 km |
| 2014 | Arthur | Category 2 | 98 mph | 169 km |
| 2005 | Ophelia | Category 1 | 86 mph | 220 km |
| 2004 | Charley | Category 1 | 86 mph | 70 km |
| 2004 | Gaston | Category 1 | 75 mph | 98 km |
| 2004 | Alex | Category 1 | 81 mph | 249 km |
| 1999 | Floyd | Category 3 | 109 mph | 167 km |
| 1999 | Dennis | Category 2 | 104 mph | 227 km |
| 1999 | Irene | Category 1 | 92 mph | 118 km |
| 1998 | Bonnie | Category 3 | 115 mph | 249 km |
| 1996 | Fran | Category 3 | 115 mph | 233 km |
| 1996 | Bertha | Category 2 | 104 mph | 193 km |
| 1989 | Hugo | Category 4 | 138 mph | 74 km |
| 1985 | Bob | Category 1 | 75 mph | 24 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
239 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 8 fatalities, 175 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 13, 2020 | EF4 | 86 km | 23.7 mi | 5 |
| Apr 13, 2020 | EF3 | 96 km | 5.7 mi | 0 |
| Sep 11, 1960 | EF3 | 70 km | 8.8 mi | 0 |
| Apr 13, 2020 | EF2 | 12 km | 1.2 mi | 0 |
| May 23, 2017 | EF2 | 71 km | 7.5 mi | 0 |
| Sep 24, 2015 | EF2 | 50 km | 6.9 mi | 0 |
| May 11, 2008 | EF2 | 39 km | 12.0 mi | 0 |
| Mar 15, 2008 | EF2 | 82 km | 7.0 mi | 0 |
| Mar 15, 2008 | EF2 | 72 km | 0.5 mi | 0 |
| Sep 3, 1998 | EF2 | 95 km | 7.0 mi | 0 |
| Sep 3, 1998 | EF2 | 7 km | 18.0 mi | 1 |
| May 10, 1998 | EF2 | 72 km | 10.5 mi | 1 |
| May 23, 1980 | EF2 | 72 km | 1.0 mi | 0 |
| May 3, 1975 | EF2 | 79 km | 5.4 mi | 0 |
| Nov 9, 1973 | EF2 | 76 km | 1.0 mi | 0 |
| Oct 27, 1972 | EF2 | 83 km | 1.0 mi | 0 |
| May 25, 1970 | EF2 | 58 km | 2.5 mi | 0 |
| Aug 29, 1964 | EF2 | 67 km | 1.0 mi | 0 |
| Sep 13, 1961 | EF2 | 74 km | 0.2 mi | 0 |
| Sep 27, 2024 | EF1 | 32 km | 2.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
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.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (4,269 acres, 2010).
| Year | Name | Acres Burned | Distance |
| 2010 | UNNAMED | 4,269 | 45 km |
| 2010 | UNNAMED | 3,746 | 41 km |
| 2010 | UNNAMED | 3,521 | 61 km |
| 1994 | UNNAMED | 3,469 | 62 km |
| 2010 | UNNAMED | 2,990 | 64 km |
| 2010 | C97 RX | 2,907 | 100 km |
| 2009 | UNNAMED | 2,906 | 59 km |
| 2004 | UNNAMED | 2,880 | 60 km |
| 2008 | UNNAMED | 2,845 | 96 km |
| 2016 | UNNAMED | 2,826 | 99 km |
| 2004 | UNNAMED | 2,661 | 24 km |
| 2004 | UNNAMED | 2,553 | 64 km |
| 1994 | UNNAMED | 2,549 | 60 km |
| 2004 | UNNAMED | 2,547 | 61 km |
| 2004 | UNNAMED | 2,446 | 26 km |
| 2008 | UNNAMED | 2,214 | 60 km |
| 2004 | UNNAMED | 2,209 | 45 km |
| 2022 | C-97 FM | 2,151 | 99 km |
| 2015 | UNNAMED | 2,111 | 99 km |
| 2007 | UNNAMED | 2,081 | 31 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
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").