The temperature ranges between a daytime high near 90 degrees in the summer and a night-time low near 60 degrees in winter. July, August, and September are the hottest months. November through March are the wettest. Despite this equable climate, deserts, rainforests, and snow exist on the islands. A packing list should include lightweight casual clothes with a sweater or jacket for evening, light rainwear, and of course a bathing suit.
Informality is the rule.
Everyone dresses casually, comfortably and colorfully. For example shorts, sandals, slacks, and sun dresses are worn during the day and night, except for a very few restaurants where a jacket for men is required. Hawaii is a healthy place to live, and the state and county governments have gone to great lengths to keep it that way. Smoking is prohibited in shopping malls, Hanauma Bay, and the Honolulu Zoo. What Samoans call a lavalava , the Fijians a sulu , and the Indonesians a kain is worn in Hawaii as a pareau.