We just got back from 16 days in Hawaii with time spent in Waikiki, Maui, Kauai, and Aulani. It didn't rain once for us. Not sure if we lucked out, if its typical, time of year, etc. There were various days that called for rain and we often watched the news in the morning and they would call for rain, but we never did see it. FWIW, we were usually on the leeward sides and near the coast. Only once did we have a cloud pass over and drop a very light mist type of shower (barely noticeable), and that was it!