When Does Summer Start In Australia 2024. When does summer start 2024 and when is the longest day? This is the longest day of the year and marks the start of summer in the northern hemisphere.

Summer in australia starts from the first of december to the end of february. The tropical north is in the midst of its wet season (november to april), which brings heavy rains and tropical storms to darwin, broome, cairns and the whitsundays.