The sea surface temperature (SST) varies much more slowly than atmospheric temperatures due to the heat capacity of water. As such, the SSTs lag the atmospheric temperatures on a seasonal timescale by about 3 months. The lowest SSTs are usually observed in early Spring and the highest SSTs are observed in early Autumn.
In tropical regions, SSTs greater than 26°C are considered suitable for formation of tropical cyclones.
The data displayed in this map is the weekly average, centred on the date shown.
12:37 AEST Parts of South Australia, Victoria and New South Wales woke up to dense fog on Sunday morning, with further morning fog likely in the coming days. Visibility plunged to 100m or below in parts of the three states.