Historical weather data, all-time temperature records, and monthly climate averages for Hilton Head Island, SC. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 on Hilton Head lands right in that sweet spot of spring, with average highs of 74° and lows of 53° across 65 years of data. There's a 31% chance of rain, but snow is essentially off the table. The date has seen wild swings though — from a balmy 87° in 1978 down to a teeth-chattering 39° in 1987.
Hilton Head's weather history has some real extremes tucked into it — the island hit a scorching 106° on June 2, 1985, the same year it bottomed out at 5° in January. The wettest single day on record dropped a stunning 8.91 inches during Hurricane Matthew in October 2016, and even a rare 6.4-inch snowfall blanketed the island back in February 1973.
Hilton Head is a summer-dominant destination, with highs peaking around 91° the first week of July and staying above 86° clear through September. If you're heat-averse, the coolest stretch runs mid-January with highs around 58°. Rain is fairly spread throughout the year but peaks in late July through early August, averaging 1.7 inches in a single week.