Warm and sunny temperatures prevail by the coast, upcountry is slightly cooler (usually by ten degrees), and the entire island is mostly dry with only slightly more rainfall in the winter. Temps average in the mid-70s, seeing a slight uptick (by just a few degrees) in July through September. Although it is a relatively dry island, rainfall does pick up a bit in the winter, from November to February.
Inland at Lanai City, temperatures can differ by 10 to 20 degrees compared to the warmer coast. This change in elevation means a light jacket is a good idea when heading into town.
Peak season spans the summer from June through August and winter from mid-December through mid-January. Punctuated by summer break and holidays like Christmas, high season means a more crowded scene and premium rates for air, hotels, and cruises. Fourth of July is especially festive with the annual Lanai Pineapple Festival, an important celebration for the former largest pineapple plantation in the world. Wildlife buffs can enjoy peak whale-watching season in January, though snorkelers may want to avoid rougher winter surf.
For better deals on airfare, visit Lanai from mid-March through May or September through early December. Spring break and Thanksgiving will mean a bump back into high-season crowds and room rates, but otherwise, spring and fall are a great time for shoulder-season discounts. From September through October, don’t miss Lanai’s best cultural celebrations, including the statewide Aloha Festivals and the Ho’okupu Hula No Lanai Cultural Festival. In October, athletes can experience the exotic landscape up close in the TriLanai Triathlon.