July 1 – The Hawaii Department of Health issues a public advisory about an outbreak of hepatitis A.[3] The source of the outbreak is traced in August to contaminated scallops served at Genki Sushi restaruants on Oʻahu and Kauaʻi.[4] 292 people are sickened by the end of the outbreak in October.[5]
July 23 – Tropical Storm Darby makes landfall on Hawaii Island. Darby is the second tropical storm to make landfall on Hawaii Island in three years, after Tropical Storm Iselle in August 2014.[6]
December 27 – U.S. president Barack Obama and Japanese prime minister Shinzo Abe meet at the USS Arizona Memorial in Pearl Harbor. Abe is the first sitting prime minister of Japan to visit the memorial since it opened in 1962.[10][11][12]
December 30 – A Cessna 172 goes missing off Molokaʻi. The aircraft is not found after a three-day search, and the three people on board are presumed dead.[13][14][15]