The Windward (East/North) side is the rainy part of Maui. This region, encompassing areas like Hana and the lush Haiku district, receives significant rainfall—up to 400 inches annually in some spots—due to the prevailing northeast trade winds. As these moist ocean winds hit the slopes of Haleakala, they are forced upward, cooling and condensing into rain clouds. This creates the iconic tropical rainforests and waterfalls the island is known for. In contrast, the Leeward (West/South) side, including Lahaina and Kihei, sits in a "rain shadow" and remains much drier and sunnier. While the West Maui Mountains also have a wet peak, the coastal resorts in South and West Maui are generally the go-to for travelers seeking a desert-like, dry climate.