page_title: Maui
section_title: Rainfall
hierarchical_section_title: Maui / Geology and topography / Climate / Rainfall
caption_attribution_description: English: Kahikinui coastline, Maui
context_page_description: The island of Maui is the second-largest of the Hawaiian Islands at 727.2 square miles and is the 17th largest island in the United States. Maui is part of the State of Hawaii and is the largest of Maui County's four islands, which include Molokaʻi, Lānaʻi, and unpopulated Kahoʻolawe. In 2010, Maui had a population of 144,444, third-highest of the Hawaiian Islands, behind that of Oʻahu and Hawaiʻi Island. Kahului is the largest census-designated place on the island with a population of 26,337 as of 2010, and is the commercial and financial hub of the island. Wailuku is the seat of Maui County and is the third-largest CDP as of 2010. Other significant places include Kīhei, Lāhainā, Makawao, Pukalani, Pāʻia, Kula, Haʻikū, and Hāna.
context_section_description: Showers are very common; while some of these are very heavy, the vast majority are light and brief. Even the heaviest rain showers are seldom accompanied by thunder and lightning. Throughout the lowlands in summer an overwhelming dominance of trade winds produces a drier season. At one extreme, the annual rainfall averages 17 inches (430 mm) to 20 inches (510 mm) or less in leeward coastal areas, such as the shoreline from Maalaea Bay to Kaupo, and near the summit of Haleakalā. At the other extreme, the annual average rainfall exceeds 300 inches (7,600 mm) along the lower windward slopes of Haleakalā, particularly along the Hāna Highway. Big Bog, a spot on the edge of Haleakala National Park overlooking Hana at about 5,400 feet elevation had an estimated mean annual rainfall of 404.4 inches over the 30-year period of 1978 to 2007. If the islands of the State of Hawaii did not exist, the average annual rainfall on the same patch of water would be about 25 inches (640 mm). Instead, the mountainous topography of Maui and the other islands induce an actual average of about 70 inches (1,800 mm). 
  Daily variations
  In the lowlands rainfall is most likely to occur throughout the year during the night or morning hours, and least likely in mid-afternoon. The most pronounced daily variations in rainfall occur during the summer because most summer rainfall consists of trade winds showers that most often occur at night. Winter rainfall in the lowlands is the result of storm activity, which is as likely to occur in the daytime as at night. Rainfall variability is far greater during the winter, when occasional storms contribute appreciably to rainfall totals. With such wide swings in rainfall, it is inevitable that there are occasional droughts, sometimes causing economic losses. These occur when winter rains fail to produce sufficient significant rainstorms, impacting normally dry areas outside the trade winds that depend on them the most. The winter of 2011-2012 produced extreme drought on the leeward sides of Moloka'i, Maui, and Island of Hawaii.
caption: Kahikinui coastline near Kaupo
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