Spring (March-May) and fall (September-November) are the sweet spot — warm enough to swim, mild enough to bike all day, and without the peak-summer crowds or humidity. Summer (June-August) is hottest and busiest, with the RBC Heritage golf tournament in mid-April drawing extra visitors. Winter is mild by Northern standards (50-60°F) but too cool for most beachgoers, and many restaurants trim hours off-season.