Spencer Gulf at sunset in South Australia. Australian Bureau of Meteorology April 4, 2016 This summer’s sea temperatures were the hottest on record for Australia: here’s why Elaine Miles, Australian Bureau of Meteorology; Claire Spillman, Australian Bureau of Meteorology; David Jones, Australian Bureau of Meteorology, and David Walland, Australian Bureau of Meteorology The summer of 2015-2016 was the hottest on record for Australia’s oceans.