Harbor Island, SC Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harbor Island, a community in Beaufort County, South Carolina.
This Afternoon
76°F
Sunny
Sunny, with a high near 76. East wind around 16 mph, with gusts as high as 24 mph.
7-day forecast for Harbor Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Sunny | 16 mph E | 9% |
| Tonight | 69°F | Partly Cloudy | 8 to 15 mph E | 3% |
| Wednesday | 76°F | Partly Sunny | 9 mph E | 6% |
| Wednesday Night | 69°F | Mostly Cloudy | 2 to 6 mph SE | 3% |
| Thursday | 77°F | Mostly Sunny | 2 to 7 mph S | 3% |
| Thursday Night | 69°F | Partly Cloudy | 6 mph S | 3% |
| Friday | 77°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 8 mph SW | 38% |
| Friday Night | 63°F | Chance Showers And Thunderstorms | 6 mph W | 38% |
| Saturday | 75°F | Mostly Sunny | 6 mph NE | 6% |
| Saturday Night | 59°F | Partly Cloudy then Slight Chance Rain Showers | 3 to 7 mph NE | 15% |
| Sunday | 71°F | Slight Chance Rain Showers | 5 to 8 mph NE | 15% |
| Sunday Night | 57°F | Partly Cloudy | 6 to 9 mph N | 14% |
| Monday | 69°F | Sunny then Slight Chance Rain Showers | 10 mph NW | 15% |
| Monday Night | 54°F | Slight Chance Rain Showers | 8 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Harbor Island (32.408, -80.438). Updated through the day.
Growing snapshot for Harbor Island
Last spring frost
Mar 3
First fall frost
Dec 9
Growing season
282 days
Hardiness zone
9b
More local growing data for Harbor Island: nearby ZIP 29920 weather · frost dates · planting calendar · South Carolina frost dates
Nearby towns & communities
Beaufort
Bluffton
Burton
Dale
Daufuskie Island
Fripp Island
Hilton Head Island
Laurel Bay
Lobeco
Port Royal
Seabrook
Sheldon
Shell Point
All South Carolina locations ›
Climate data from the nearest NOAA station, Beaufort Wwtp, Sc (8.6 mi from Harbor Island). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.