18 January 2026 sits in the middle of the Australian summer, when the southern states run hot and dry with bushfire risk at its seasonal peak. The tropical north sits inside its wet season, part of the cyclone season that runs from November through to April every year. Daylight saving stays in effect in New South Wales, Victoria, South Australia, Tasmania and the ACT for the whole of January, keeping evenings light well past eight in the evening across those five states.
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 18 January 2026 falls on this day of the week, at the close of the weekend, immediately before the working week resumes.
2026 has 365 days on the calendar. Leap years add a single extra day to February, giving those years 366 days instead of 365 and shifting the day-of-year number for every date from March onward by one compared with an ordinary year. This is the only irregularity in the length of the Australian calendar year.
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