NorthThe North is wetter due to the tradewinds and the mountains. Kauai's South Shore is drier, which means more bright, warm, picture-perfect beach days.
Which Hawaii island gets least rain?
The driest part of the Hawaiian islands is the northwest coast of the Big Island, in the shadow of the big mountains, which gets less rain from the Kona storms that can come up from the south in winter, and almost no rain from the tradewinds in the summer, because it's in the rain shadow.