More rainfall forecast for over two-thirds of Australia for late-winter and early-spring

BOM has predicted a wetter-than-median August to October for Queensland, NSW, Victoria, SA, the NT, and eastern parts of WA and Tasmania.

Those areas are two to three-and-half times more likely to have unusually high rainfall in the coming months.

The forecast comes as parts of NSW stretching from Newcastle to the South Coast were hit by devastating floods in early July - the third time in some of these areas this year alone.

BOM's outlook says that a negative Indian Ocean Dipole (IOD), which increases the chance of above average winter and spring rain, will likely cause the rise in rainfall.

The negative IOD event is also expected to bring warmer than median day temperatures to the far north and southern parts of Australia, and warmer night temperatures for most of the country from August to October.

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The negative IOD and a 50 per cent chance of La Nina's return in the spring, however, will likely see the east coast have cooler temperatures, particularly around in-land NSW and southeast Queensland, according to BOM.