8 to 30 June – Perth receives 18.74 inches (476.1 mm) of rain in twenty-three days, easily its heaviest monthly rainfall on record[1][2] and unlikely to be approached due to anthropogenic global warming.[3]
6 July – Frank Forde is sworn in as Prime Minister of Australia, following the death of John Curtin. He will serve Australia's shortest term as prime minister, being replaced by Ben Chifley a week later.
29 September – The 1945 VFL Grand Final is held, and becomes known as the "Bloodbath" due to the wet, muddy conditions and frequent violence between players and amongst the spectators. Carlton defeats South Melbourne 15.13 (103) to 10.15 (75).
26 December – The firstSydney to Hobart Yacht Race begins. The British yacht Rani wins both line honours and the handicap, arriving in Hobart on 3 January.
^"Perth Metro (Mount Lawley) monthly rainfall". Australian Bureau of Meteorology.
^See Stage 3: Summary for Policymakers (Report). Indian Ocean Climate Initiative (1997-2012). Western Australian Department of Water and Environmental Regulation. 2012.