New South Wales

New South Wales runs the longest stretch of the Australian east coast, from the Queensland border down past Sydney to the Victorian line. Sydney Harbour at Fort Denison sits at about 1.2 metres mean range, climbing toward 1.6 on spring tides — modest in absolute terms, but the harbour geometry and the headland-narrowed flow at Spit Bridge concentrate currents on the change of tide. The pattern is semidiurnal, two highs and two lows about twelve and a half hours apart. Ferry traffic doesn't notice; paddlers crossing the main channel, fishers working Middle Harbour, and tidal-pool swimmers at Bronte, Bondi Icebergs, and Mahon all read the table for different reasons. Pools refill from incoming swell on the high and drain partially on the low, so calmer swimming and exposed pool walls go together at the bottom of the cycle. Watch for swell-driven washover at the top in big sea states. Open-Meteo Marine drives the gridded forecasts on this site; the Australian Bureau of Meteorology runs the authoritative Fort Denison gauge.