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.
Today
87°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. Northwest wind 2 to 6 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harbor Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph NW | 31% |
| Tonight | 76°F | Chance Showers And Thunderstorms | 2 to 6 mph E | 35% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 6 mph NE | 39% |
| Sunday Night | 76°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 6 mph SE | 18% |
| Monday | 85°F | Slight Chance Showers And Thunderstorms | 2 to 8 mph NE | 24% |
| Monday Night | 76°F | Chance Showers And Thunderstorms | 2 to 7 mph E | 40% |
| Tuesday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 3 to 9 mph NE | 66% |
| Tuesday Night | 74°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 to 9 mph NE | 66% |
| Wednesday | 82°F | Chance Showers And Thunderstorms | 10 to 14 mph NE | 52% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 14 mph NE | 52% |
| Thursday | 82°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 12 to 15 mph NE | 23% |
| Thursday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 13 mph NE | 23% |
| Friday | 80°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 13 mph NE | 23% |
| Friday Night | 69°F | Slight Chance Showers And Thunderstorms | 7 to 12 mph NE | 23% |
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
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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 Sep 19, 2026.