The southern and southwestern belts of the continent enjoy a more familiar temperate or Mediterranean climate. Perth, Adelaide, and Melbourne are characterised by mild, wet winters and warm to hot, dry summers. This pattern is driven by the seasonal migration of the westerly wind belt and associated cold fronts, which sweep up from the Southern Ocean, bringing vital winter rains to replenish dams and soil moisture. However, this is also the front line of Australia’s most dramatic and dangerous weather phenomenon: bushfire season. The combination of a long, hot summer, the desiccating effects of the Foehn-like northerly winds, and the accumulation of dry fuel creates a powder keg. It is during these hot, windy summer days that catastrophic fire conditions emerge, as tragically witnessed during Black Saturday (2009) and the Black Summer of 2019–2020, where entire towns were razed and ecosystems devastated.

In stark contrast to the dry interior, the northern third of Australia experiences a tropical monsoon climate, defined by a dramatic binary of seasons: the Wet and the Dry. From November to April, the monsoon trough brings oppressive humidity, spectacular thunderstorms, and torrential rains that transform parched landscapes into vast wetlands, cut roads, and isolate communities. This is also the season of tropical cyclones, which spin in from the warm Timor and Coral Seas, bringing destructive winds and storm surges to coastal towns like Darwin and Cairns. The arrival of the Dry around May brings a breath-taking relief: cloudless azure skies, warm days, cool nights, and prevailing southeasterly trade winds. For the Indigenous peoples of the Top End, these are not just weather patterns but the foundation of a six-season calendar, dictating when to burn, hunt, and harvest.

In the 21st century, this already extreme and variable climate is being profoundly reshaped by global warming. Australia is a continent on the front line of climate change. Average temperatures have risen by over 1.4°C since 1910, leading to an increase in record-breaking heatwaves, longer fire seasons, and more intense downpours. The ocean warming around its coasts is bleaching the Great Barrier Reef and affecting marine ecosystems. Rising sea levels threaten coastal cities like Sydney and Brisbane. Furthermore, long-term rainfall patterns are shifting, with a projected decline in cool-season rains across the south, threatening water security for cities and farms alike. The nation finds itself at a critical juncture, grappling with the need to transition its economy away from fossil fuels while adapting to the unavoidable impacts already locked into its future climate.

The most dominant feature of Australia’s climate is its aridity. Often described as the world’s driest inhabited continent (after Antarctica), more than two-thirds of the country receives less than 500 millimetres of rain annually. The vast, red heart of the nation, encompassing the Great Sandy, Gibson, and Simpson Deserts, is shaped by persistent high-pressure systems that suppress cloud formation and rainfall. This aridity is not uniform, however. A classic "continental" pattern emerges: rainfall generally increases towards the coast, with the lush, green eastern seaboard and the tropical far north receiving the most precipitation. This creates a stark hydrological divide. The Murray-Darling Basin, Australia’s food bowl, relies on the precarious flows of rivers that are notoriously variable, subject to both prolonged "millennium droughts" and destructive floods.