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Hilton Head Island has a humid subtropical climate.
Hot, humid summers. Cool-to-cold winters. Rain in every month of the year — here's what that means in plain terms.
What this climate feels like
The four things a regular visitor actually wants to know:
Highs near 92°F in July. About 81 days a year above 90 °F.
Lows near 40°F in January. About 21 freezing nights a year.
About 48 in of rain a year. Wettest in June.
A roughly even mix of sun and cloud.
What "humid subtropical" means
Climate scientists sort every place on Earth into about 30 climate types, based on how hot, cold, wet and dry it is across the year. Hilton Head Island's type — humid subtropical — sits in the broad family of mild, temperate climates. Despite the name, it does not mean tropical or frost-free: Hilton Head Island still has cool-to-cold winters.
Researchers write climate types as a short letter code. Here is what each letter means:
Cities with the same climate as Hilton Head Island
A humid subtropical climate (Cfa) — these recognizable cities share it. If you know one of them, you know roughly what to expect.
Has Hilton Head Island's climate type changed?
Stable — Hilton Head Island's climate has held the same type between the 1971–2000 and 1991–2020 normals. The label is steady; the climate beneath it is still warming.
What this climate means for you
Warm-season grasses and broad-leaved evergreens thrive; gardens are productive but humidity brings fungal pressure. Frost is occasional, so tender perennials often overwinter.
Spring and autumn are pleasant; summer is hot and humid; winter is mild and a fine alternative to escaping cold further north.
Hot, sticky summers and mild winters — air conditioning runs hard from late spring to early autumn. Storm season needs preparation in coastal areas.
Where these numbers come from
The climate type and the month-by-month figures on this page are computed from Hilton Head Island's measured 30-year climate normals (1991–2020) — the same official records behind Hilton Head Island's main climate page, so the two always agree.
Long-range climate maps measure things slightly differently and can place a city in a neighbouring category. Where they differ, this page uses the measured station record as the climate today.
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Savannah Intl AP (NOAA GHCN station USW00003822), about 44 km from the city centre.