Climate & Weather in Hilton Head Island
Hilton Head has a genuine humid subtropical (Koppen Cfa) climate -- mild winters, hot and humid summers, and abundant year-round rainfall -- a real, warm, coastal climate distinct from both the four-season inland climates and the arid desert climates covered elsewhere in this project.
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Learn moreReal, mild winters and hot, humid summers
Hilton Head's average annual temperature runs around 74°F, with average January highs of 57°F and average July/August highs of 90°F -- genuine seasonal variation, but with winter lows that rarely approach the sustained cold covered in this project's inland and mountain markets. Summers are hot and humid, with the kind of afternoon-thunderstorm pattern common to Southeast coastal climates.
Real, significant humidity swings by time of day
Relative humidity averages 86% at 7am and 54% at 1pm -- a genuinely large daily swing that shapes how the island actually feels hour to hour, with muggy mornings giving way to comparatively drier (though still warm) afternoons.
Abundant, genuinely seasonal rainfall
Hilton Head averages 49 inches of rainfall annually, with August as the wettest month (6.06 inches average) and January the driest (1.02 inches average) -- a real, disclosed seasonal rainfall pattern that broadly tracks hurricane season's peak months rather than distributing evenly across the year.
Hurricane season is a real, defining climate feature, not a separate topic
Atlantic hurricane season (June-November) is inseparable from Hilton Head's honest climate profile -- see the flood-hurricane-risk topic page for the full, documented history (Hurricane Matthew 2016, Hurricane Dorian 2019) and the real, structural barrier-island exposure that comes with this climate zone.
Key takeaways
- Hilton Head has a genuine humid subtropical (Koppen Cfa) climate: average annual temperature ~74°F, January highs averaging 57°F, July/August highs averaging 90°F.
- Relative humidity swings widely by time of day -- averaging 86% at 7am versus 54% at 1pm.
- Annual rainfall averages 49 inches, with August the wettest month (6.06 in.) and January the driest (1.02 in.) -- a pattern that broadly tracks hurricane season.
- Hurricane season (June-November) is a defining, inseparable feature of this climate zone -- see the flood-hurricane-risk topic page for the full documented history and barrier-island exposure.
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