When Does Summer Start 2025 Australian Dates. Get a comprehensive look at school term dates and holidays across australian states & territories for 2024 & 2025. The data correspond to the seasons of the year 2025.
School starts for most states on tuesday, 28 january 2025. Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth’s axis having reached its furthest tilt and begins to change directiion back.