another exceptionally warm year across Australia
| Key Points |
|
Melbourne's desalination plant roared into operation this year, its first activation since the drought years of 2022.
The decision followed months of falling dam levels and persistent rainfall deficits. Water authorities switched on the system as storages slipped toward two-thirds capacity.[1]
The Bureau of Meteorology's Climate Statement 2025 to 26 confirms the pattern was national in scope. It tracks rainfall, temperature, water availability, and ocean and atmospheric conditions from July 2025 to June 2026.
The findings reveal accelerating extremes across Australia's atmosphere, oceans, and river systems.[2]
Nationally, autumn 2026 ran 0.67 degrees Celsius warmer than the historical average. Tasmania, Victoria, and New South Wales ranked among their ten warmest autumns since 1910. Unseasonable warmth persisted into May, setting fresh daily temperature records across the south-east.[3]
Australia's 2025 calendar year ranked as its fourth-warmest since national temperature records began in 1910. Average temperatures sat 1.23 degrees Celsius above the long-term benchmark. Maximum temperatures ranked equal fourth-highest, while overnight minimums ranked eighth-highest on record.[4]
Heatwave conditions struck repeatedly, spanning January through March and returning again in October. Extreme intensity affected inland regions during both periods. Farmers and outdoor workers bore the brunt of the sustained heat stress.
Scientists link the intensifying heat to long-term greenhouse gas emissions trends. Warming has accelerated tropical cyclone activity and reshaped seasonal rainfall patterns nationwide. Cyclones Fina and Hayley brought early and unusually intense wet-season rainfall to the north.[5]
Northern Australia entered its wet season wetter than usual between October and December. Tropical cyclones and an early monsoon drove above-average rainfall across Queensland and the Northern Territory. Parts of north-western Queensland recorded their highest October to December rainfall on record.[5]
Autumn brought a national rainfall surplus of twenty-five per cent above the historical average. March ranked as Australia's seventh-wettest since 1900, driven by tropical systems reaching central regions. South Australia and the Northern Territory each recorded one of their wettest autumns on record.[3]
Southern Australia told a very different story through the cool season months. Cool season rainfall across southern Australia remained below the long-term average for a third consecutive year. Serious rainfall deficiencies persisted across agricultural regions of South Australia and western Victoria.[7]
By April 2026, rainfall deficiency zones had deepened across north-eastern New South Wales and bordering areas of Queensland. The Northern Tablelands recorded its lowest rainfall on record for the four-month period. Soil moisture across the region fell to its lowest decile in more than a century.[1]
Surface water storage nationally continued its multi-year decline through the reporting period. The previous financial year alone saw national storage fall from seventy-four per cent to sixty-five per cent of capacity. Melbourne's reservoirs dropped further still, prompting the desalination plant restart.[6]
The Murray-Darling Basin, Australia's most contested river system, faced compounding stress this year. Major storages across the basin fell sharply during the preceding financial year, dropping from seventy-eight to sixty-one per cent capacity. Continued dry conditions through 2025 to 26 offered little reprieve for basin communities.[6]
Groundwater trends showed similar strain beneath the visible landscape. Bores across south-eastern South Australia and western Victoria kept declining despite scattered wet-season relief. Aquifers recharge slowly, meaning today's extraction can outpace decades of accumulated rainfall.
Indigenous water knowledge offers an underused resource for managing this growing scarcity. Cultural understanding of Country, built over tens of thousands of years, is increasingly recognised in drought planning. Researchers argue integrating this knowledge could strengthen national resilience strategies considerably.[9]
Sea surface temperatures around Australia reached record warmth for a second consecutive year. The 2025 calendar year average sat 0.93 degrees Celsius above the historical 1961 to 1990 benchmark. Warmer oceans fuel more intense rainfall and strengthen tropical cyclone development.[4]
The monsoon at Darwin arrived unusually late during the preceding wet season, delaying seasonal relief for the tropical north. Climate drivers, including a weakening La NiƱa pattern, shaped rainfall distribution through the reporting period. These oceanic and atmospheric signals increasingly diverge from historical norms.[6]
Far south, Antarctic sea ice extent remained historically low throughout 2025. It ranked fourth-lowest for summer and third-lowest for winter conditions. Reduced ice cover has flow-on effects for Southern Ocean weather systems affecting Australia.[4]
Atmospheric circulation patterns continued shifting toward more frequent high-pressure blocking systems. This pattern pushes rain-bearing fronts further south, away from the mainland. The shift compounds southern Australia's long-term cool season rainfall decline.
Climate Council researchers warn that Australia's water security has already shifted markedly under climate change. Rainfall patterns are becoming less predictable while flood and drought severity both increase. Governments face growing pressure to plan infrastructure for a wider range of extremes.[8]
Farming communities across the Basin and southern grain belt carry disproportionate financial exposure. Reduced stream flow and falling storages threaten irrigation allocations and rural livelihoods directly. Agricultural advocates continue pressing for faster drought support and clearer long-term water planning.
Urban water authorities face their own accountability questions over desalination and demand management. Melbourne and Adelaide both leaned heavily on energy-intensive desalination infrastructure to offset shrinking dam supplies. Critics argue reactive infrastructure spending should be matched with stronger emissions reduction policy.
The Bureau's findings place fresh pressure on federal and state climate adaptation strategies. Every fraction of a degree recorded compounds risks to communities, ecosystems, and food systems. Accountability for the response now rests squarely with policymakers across every level of government.
Australia's Climate Statement 2025 to 26 confirms an intensifying pattern rather than an isolated anomaly. Rising temperatures, divided rainfall and shrinking storages now define the national climate picture. Every part of the system, from tropical north to temperate south, now sits under strain.
Communities from the Murray-Darling Basin to Melbourne's suburbs already feel these pressures directly. Farmers, First Nations custodians and city water authorities each carry different but connected burdens. Each faces mounting costs as familiar rainfall patterns fail to return.
Governments hold the evidence needed to act decisively on adaptation and emissions policy. Continued delay simply shifts costs onto future generations facing an increasingly unstable climate system. The window for affordable, effective adaptation continues narrowing with each passing year.
References
1. Australia Rainfall Deficiencies Deepen Across Eastern States. Reports on compounding rainfall deficits and record-low soil moisture through April 2026.
2. Climate statement 2025–26 now available. The Bureau of Meteorology's official summary release for the reporting period.
3. Australia in Autumn 2026. The Bureau of Meteorology's seasonal climate summary for March to May 2026.
4. Bureau of Meteorology releases Annual Climate Statement 2025. Official record of Australia's 2025 calendar year temperature and ocean conditions.
5. Annual Statement 2025. Detailed Bureau of Meteorology analysis of rainfall, cyclones and seasonal drivers for 2025.
6. Financial Year Australian Climate and Water Statement 2024–25. The Bureau of Meteorology's prior-year water resources and Murray-Darling Basin storage data.
7. Drought Statement. The Bureau of Meteorology's ongoing monitoring of rainfall deficiencies and water availability.
8. Deluge & Drought: Water Security in a Changing Climate. Climate Council analysis of shifting flood and drought risk under climate change.
9. Drought resilience. CSIRO research on Indigenous cultural knowledge and national drought planning.





