Na Pali Coast in September

April through October offers your best shot at calm seas and clear trails. Summer swells average 2-4 feet versus winter's 15-20 foot monsters, making boat tours actually pleasant instead of endurance tests. The trade winds pick up in June, bringing cooler temperatures for hiking — crucial when you're scrambling over exposed ridges. But shoulder seasons have their perks. Late October can be magical with fewer crowds and still-decent weather. Early April brings wildflowers and waterfalls at full flow from winter rains. Avoid December through February unless you're an experienced ocean person — winter storms can make the coast completely inaccessible for weeks. And here's something most guides won't tell you: even in summer, afternoon clouds roll in fast. Start early, finish by 2 PM, and always check marine forecasts before committing to boat trips.