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
Slight Chance Showers And Thunderstorms then Mostly Sunny
A slight chance of showers and thunderstorms before 10am. Mostly sunny, with a high near 87. South wind 3 to 13 mph. Chance of precipitation is 20%.
7-day forecast for Harbor Island
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 3 to 13 mph S | 16% |
| Tonight | 79°F | Chance Showers And Thunderstorms | 7 to 13 mph S | 55% |
| Wednesday | 87°F | Showers And Thunderstorms Likely then Partly Sunny | 6 to 13 mph S | 55% |
| Wednesday Night | 80°F | Chance Showers And Thunderstorms | 7 to 13 mph S | 46% |
| Thursday | 87°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 46% |
| Thursday Night | 80°F | Chance Showers And Thunderstorms | 6 to 10 mph SE | 25% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 to 12 mph SE | 42% |
| Friday Night | 79°F | Chance Showers And Thunderstorms | 6 to 10 mph SE | 37% |
| Saturday | 87°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph SE | 62% |
| Saturday Night | 79°F | Chance Showers And Thunderstorms | 5 to 9 mph S | 33% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 3 to 10 mph S | 45% |
| Sunday Night | 80°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 32% |
| Monday | 89°F | Chance Showers And Thunderstorms | 5 to 12 mph SW | 30% |
| Monday Night | 80°F | Chance Showers And Thunderstorms | 6 to 12 mph SW | 30% |
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 Aug 4, 2026.