Climate change eclipses La Nia cooling in Australia to drive extreme heatwave and heightened fire risk

A study by World Weather Attribution found that human-induced climate change made a January 2026 heatwave in south-eastern Australia approximately 1.6°C hotter and about 5 times more likely than in a preindustrial climate. Despite a weak La Niña phase reducing the event's severity by 0.3–0.5°C, the warming driven by climate change remained the dominant factor. The event caused a 25% increase in emergencies in Melbourne and created dangerous fire weather in Victoria and New South Wales comparable to the 2009 Black Saturday bushfires. The report also notes that abundant renewable generation, with solar providing over 60% of midday electricity, helped meet record demand more smoothly than in previous heatwaves.

• Human-induced climate change increased the intensity of the January 2026 heat event by approximately 1.6°C and made similar events about 5 times more likely to occur compared to a preindustrial climate, though this likelihood is considered an underestimate.
• While a weak La Niña phase before the summer reduced the likelihood of the heatwave by 20–45% and lowered 3-day maximum temperatures by 0.3–0.5°C, the risk increase driven by climate change was the dominant influence.
• The heatwave caused significant health and environmental crises, including a 25% rise in emergency cases in Melbourne and fire weather conditions in Victoria and New South Wales that were comparable to those before the 2009 Black Saturday bushfires.
• Renewable energy played a critical role in maintaining electricity stability during record demand, with solar power alone providing more than 60% of midday electricity.
• Future projections indicate that if global warming reaches an additional 1.3°C by the end of the century under current policies, such heat events will become 1.5°C warmer and 3 times more likely.

APA

World Weather Attribution (2026). Climate change eclipses La Nia cooling in Australia to drive extreme heatwave and heightened fire risk. https://www.worldweatherattribution.org/climate-change-eclipses-la-nina-cooling-in-australia-to-drive-extreme-heatwave-and-heightened-fire-risk/

Chicago

World Weather Attribution. Climate change eclipses La Nia cooling in Australia to drive extreme heatwave and heightened fire risk. 2026. https://www.worldweatherattribution.org/climate-change-eclipses-la-nina-cooling-in-australia-to-drive-extreme-heatwave-and-heightened-fire-risk/.

Wikipedia

{{cite report |author=World Weather Attribution |title=Climate change eclipses La Nia cooling in Australia to drive extreme heatwave and heightened fire risk |date=22 January 2026 |url=https://www.worldweatherattribution.org/climate-change-eclipses-la-nina-cooling-in-australia-to-drive-extreme-heatwave-and-heightened-fire-risk/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{worldweatherattribution2026climate, author = {{World Weather Attribution}}, title = {{Climate change eclipses La Nia cooling in Australia to drive extreme heatwave and heightened fire risk}}, institution = {World Weather Attribution}, year = {2026}, month = jan, url = {https://www.worldweatherattribution.org/climate-change-eclipses-la-nina-cooling-in-australia-to-drive-extreme-heatwave-and-heightened-fire-risk/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }