January 31 – Lieutenant governor Shan Tsutsui abruptly resigns to accept a job with a political strategy firm.[3] Attorney general Doug Chin is named his successor after Senate President Ron Kouchi and House Speaker Scott Saiki decline to accept the position.[4][5]
April 13 – 2018 Hawaii floods: Heavy rainfall on the islands of Kauaʻi and Oʻahu causes widespread flash flooding and landslides, resulting in $125 million in property damage.[7][8][9]
May 3 –
2018 lower Puna eruption: Kīlauea on Hawaii Island begins erupting in the residential neighborhood of Leilani Estates.[10] Over 700 homes are destroyed by the end of the eruption on September 5.[11][12] The end of the eruption in Puna is also the first time in 35 years that Kīlauea is not erupting.[13]
August 22 – Hurricane Lane causes heavy rainfall and widespread flooding across the entire state,[16][17] and contributed to a wildfire in Kauaula Valley on Maui.[18][19]
September 12 – Hurricane Olivia becomes the first named storm in recorded history to make landfall on the island of Maui.[20]
October 8 – 2,700 union members of UNITE HERE Local 5 employed at four hotels on Oʻahu and one hotel on Maui go on strike as part of the nationwide 2018 Marriott Hotels strike.[21] The strike in Hawaii ends after union members ratify a new contract on November 27.[22]
