Long days of sunshine and fairly mild year-round temperatures make Hawaii, including Maui, an all-season destination. Most resort areas are at sea level, with average afternoon temperatures of 75°F to 80°F during the coldest months of December and January; during the hottest months of August and September the temperature often reaches 90°F. Higher "Upcountry" elevations have cooler and often misty conditions. Only at mountain summits does it reach freezing.
Moist trade winds drop their precipitation on the north and east sides of all the Islands, creating tropical climates, whereas the south and west sides remain hot and dry with desertlike conditions. Rainfall can be high in winter, particularly on the North and East shores.
Many travelers head to the Islands in winter, especially during Christmas and spring break. This means that fewer travel bargains are available; room rates average 10% to 15% higher during these times than the rest of the year.
Typically the weather on Maui is drier in summer (more guaranteed beach days) and rainier in winter (greener foliage, better waterfalls). Throughout the year, West Maui and the South Shore (the leeward areas) are the driest, sunniest areas on the island—that's why the resorts are there. The North Shore and East Maui and Hana (the windward areas) get the most rain, are densely forested, and abound with waterfalls and rainbows.
Hawaiians appreciate any occasion to celebrate; not only are indigenous Hawaiian holidays honored, so are those of the state's early immigrant cultures. If you happen to be in the Islands on March 26 or June 11, you'll notice light traffic and busy beaches—these are state holidays. March 26 recognizes the birthday of Prince Jonah Kuhio Kalanianaole, a member of the royal line who served as a delegate to Congress and spearheaded the effort to set aside homelands for Hawaiian people. June 11 honors the first island-wide monarch, Kamehameha I; locals drape his statues with lei and stage elaborate parades. May 1 isn't an official holiday, but it's Lei Day in Hawaii, when schools and civic groups celebrate the flower lei with lei-making contests and pageants. Statehood Day is celebrated on the third Friday in August (Admission Day was August 21, 1959). Most Japanese and Chinese holidays are widely observed. On Chinese New Year, in winter, homes and businesses sprout red good-luck mottoes, lions dance in the streets, and everybody eats gau (steamed pudding) and jai (vegetarian stew). Good Friday is a state holiday in spring, a favorite for picnics. Summertime is for Obon festivals and the July 4 Rodeo; the Maui County Fair and Aloha Festivals are in fall.
The following are average maximum and minimum temperatures for Lahaina in West Maui; the temperatures throughout the Hawaiian Islands are similar.