Australia’s air temperatures over land and oceans have already increased and this warming is faster than the global average(Loughetal.2011).There are modelled records of daily maximum and minimum air temperature, including daily and monthly averages at spatial resolutions of 0.0580.058 (,5km5km) (Jones et al. 2009), but few long-term data for estuarine water temperatures. Estuarine waters are expected to warm; such warming may be further accelerated in Australian estuaries because many are shallow (exceptions include the central coast of New South Wales and some parts of Tasmania) and small in water area.