Oahu in May

April, May, September, October, and November offer Oahu's sweet spot — fewer crowds, reasonable hotel rates, and great weather. Ocean temperatures stay warm year-round (75-82°F), so you're always swimming in comfort. Winter (December-March) brings big waves to the North Shore, making it prime time for watching professional surfing competitions. But it also brings peak tourist season, with hotel rates at their highest and beaches at their most crowded. Rain is more frequent, though it usually comes in short bursts. Summer (June-August) means calmer ocean conditions and perfect beach weather. But it also means higher prices and more families with kids on school break. The North Shore transforms from a surfing mecca to a swimming and snorkeling paradise. Fall (September-November) might be the island's best-kept secret. Hurricane season technically runs through November, but storms rarely impact Oahu directly. You get summer-like weather with fewer crowds and better hotel deals. Spring (April-May) offers similar advantages to fall — great weather, manageable crowds, and reasonable prices. The ocean is warming up from winter, and you'll catch the tail end of humpback whale season. Avoid major holidays and school breaks if crowds bother you. Presidents Day week, spring break, and the weeks around Christmas and New Year see the heaviest visitor numbers. Hotel rates can double during these peak periods.