A powerful high-pressure system is set to dominate Australia’s weather this Wednesday, July 15, 2026 bringing predominantly settled and dry conditions across much of the continent.
Recording a pressure of 1040 hectopascals, the strong system is currently moving across southern Australia. While the system promises clear skies for many, it is also triggering morning fog and frost across inland regions, alongside elevated fire dangers in the north.
New South Wales and the ACT
Much of New South Wales will experience a very settled day, with morning fog and frost predicted for eastern inland parts. However, a southerly flow, assisted by a mid-level atmospheric trough, is driving shower activity along the New South Wales coastline. These showers will begin in the south before contracting to the central and northern coastal areas. The northern coastline is expected to see persistent showers for several days. Sydney will reach a top of 18 degrees Celsius with a possible shower on the coastal fringe, while Canberra will start with frost before warming to a sunny 14 degrees.
Queensland and the Northern Territory
Queensland will see a mostly settled Wednesday. Inland parts of the south-east will experience below-average morning temperatures, with frost possible through the Darling Downs and fog stretching from Bundaberg up to Cairns. While mostly dry and sunny, isolated showers may impact the far southern and northern coastal fringes. Brisbane is forecast to reach 22 degrees and remain mostly sunny.
In the Northern Territory, dry south-easterly winds are moving through, creating gusty conditions in central areas. This dry air reaches the Top End, elevating the fire danger for the Darwin and Adelaide River regions, where active fires are already burning. Darwin will warm from 21 degrees in the morning to a sunny top of 32 degrees.
Victoria and Tasmania
Northern Victoria remains very settled with morning fog and frost. The state’s south will experience partly cloudy conditions and isolated showers due to a south-westerly flow. Melbourne is expecting a partly cloudy day with a top of 15 degrees.
Tasmania will see a westerly flow, increasing cloud cover and showers in the western half of the state. The east will remain clear with possible morning frost. Hobart is forecast to be partly cloudy with a top of 14 degrees.
South Australia and Western Australia
Sitting directly under the centre of the high-pressure system, South Australia will see a very settled day. Morning fog will cover southern agricultural areas, including the Adelaide Hills. Adelaide will clear to a sunny 16 degrees.
Western Australia will also be very dry. Temperatures are sitting 8 to 10 degrees above average around the Shark Bay area ahead of a frontal system due on Thursday. This approaching system may bring an isolated shower to the south-west Capes late on Wednesday evening. Perth is expecting a dry and sunny 24 degrees.
