Spring in Australia is a time for celebration, with various events and festivals taking place across the country:
Spring is the "shoulder season," meaning it is generally cheaper and less crowded than summer, though visitors should watch for the mid-season school holidays (late September to mid-October). australia.com Australia’s seasons australia spring months
This applies to most of Australia, including major cities like Sydney, Melbourne, Brisbane, Perth, and Adelaide. The tropical north (e.g., Darwin) has a wet–dry season cycle rather than four distinct temperate seasons, but September–November is still considered the "dry season" transitioning toward the wet season. Spring in Australia is a time for celebration,