Father's Day is observed on the first Sunday of September every year, shaping retail trade for the week either side of it. 20 September 2026 falls inside the same 30-day month as this observance, in the first month of the Australian spring, as warmer weather returns across the southern half of the country.
A public holiday that falls on a Sunday sits inside the weekend rather than beside it, and whether a substitute day off applies to the following Monday depends on the specific holiday and the state. Sunday 20 September 2026 falls on this day of the week, at the close of the weekend, immediately before the working week resumes.
The working-day count on this page excludes both weekend days and any public holiday declared for the state selected, so the same date in 2026 can show a different total depending on which state's calendar applies to 20 September. Interstate businesses need to check more than one state's list before setting a national deadline.
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