The Big Island’s rainy season typically runs from November to April. While rain showers can be expected, they are often brief and can bring refreshing breaks from the tropical warmth. Also, it is much drier on the leeward side (western coast) of the island.
If you’re looking to maximize sunny days, consider visiting outside these months. Just remember, the Big Island is vast, and even during the rainy season, there’s often sunshine in different parts of the island.