An extended heatwave across southeastern Australia is pushing temperatures toward 50C in some inland areas and sustaining high overnight warmth, increasing bushfire risk and adding to an already active catastrophe season for insurers. The event coincides with the Australia Day period and is expected to continue into the weekend across parts of South Australia, Victoria, and New South Wales. The Bureau of Meteorology (BOM) has reported widespread maximum temperatures above 45C, including 48.5C at Oodnadatta in South Australia and 47.2C at Hay in New South Wales.
Forecasts indicate inland centres such as Mildura may approach 49C, while Adelaide, Melbourne, and other locations in Victoria and inland NSW are expected to record temperatures in the mid to high 40s over several days. BOM meteorologist Sarah Scully said the impact of the heatwave is being shaped by conditions at night as well as during the day. “It’s the overnight minimums that are contributing to this persistent heatwave event,” Scully said, as reported by News.com.au. In parts of South Australia, minimum temperatures have remained in the low to mid‑30s, reducing opportunities for people, infrastructure, and essential services to cool down between daytime peaks.
The heatwave is linked to a broader synoptic pattern involving tropical systems over northern Australia and high‑pressure systems over the Tasman Sea and other regions. These features have combined to keep very hot, dry air in place over the southeast. BOM senior meteorologist Dean Narramore attributed the event to “non-stop” tropical lows and rain across northern Australia, which have contributed to a mass of sinking, warming air. “As that air sinks, it warms and dries out, and you can get these big domes of heat that normally sit over central and inland Australia. This week, thanks to a high in the Tasman Sea, remnants of ex-tropical cyclone Luna (are) moving down through Western Australia. This heat has got trapped between all these weather systems, so that bubble of heat is sitting over southeastern Australia, surrounded by weather everywhere else,” Narramore said.
Narramore said that from Jan. 26 through the end of the week, “many areas are looking at days of maximum temperatures in the mid-to-high 40s, with severe heatwave conditions across all of southeastern Australia,” and that “extreme heatwave conditions (are) possible for some areas through inland parts of Victoria, NSW, and South Australia.” A trough moving from South Australia into Victoria and then inland New South Wales is bringing very hot, dry, and gusty south‑westerly winds. Thunderstorms are forecast, but BOM has warned that rainfall may evaporate before reaching the ground, raising the likelihood of dry lightning and new ignitions. Fire danger ratings are expected to reach elevated or extreme levels across southeastern South Australia, western and central Victoria – including Melbourne – and later inland NSW.
In Adelaide, where temperatures were forecast to reach about 45C on Australia Day, authorities issued a heatwave warning for the metropolitan area and surrounding districts including Clare, Kingscote, Maitland, Mount Barker, Narracoorte, Port Pirie, Port Augusta, Renmark, Roxby Downs, and the Barossa Valley. Across coastal and near‑coastal regions of South Australia, maximum temperatures between the high 30s and high 40s are forecast from Jan. 26 to 28, with overnight lows remaining in the mid‑20s to low‑30s.
The conditions led organisers to cancel the annual Aus Lights on the River Australia Day event at Elder Park/Tarntanya Wama in central Adelaide. “Despite our best efforts and ongoing consultation with emergency services and key authorities, we have not been able to safely proceed (with the event). While we are incredibly disappointed, the safety of our community must always come first,” Australia Day Council of South Australia chief executive Jan Chorley said. The BOM has advised residents – particularly older people, children, pregnant, and breastfeeding women and those with existing medical conditions – to limit time in the heat and use cooler locations such as homes, libraries, community centres, or shopping centres. Recommendations include closing windows, blinds, and curtains early in the day and monitoring official heat and fire updates.
The heatwave is occurring alongside an active bushfire period in Victoria, where several fires that started earlier in January remain uncontained. Authorities have reported substantial property and livestock losses, with a number of communities experiencing repeated warnings as wind changes alter fire behaviour and direction. In the Otways and parts of northeast Victoria, emergency alerts have advised residents in some locations that it is too late to leave safely and that they should shelter in place, with out‑of‑control fires changing direction in response to shifting winds. Embers have been reported starting spot fires kilometres ahead of main fire fronts, adding to operational complexity for emergency services.
In light of the scale and spread of the Victorian fires, the Insurance Council of Australia (ICA) has upgraded its earlier significant event declaration to an Insurance Catastrophe, covering fires across 18 local government areas since January 7. The catastrophe declaration activates industry‑wide response protocols, including prioritisation of claims from affected policyholders, structured triage to identify customers requiring urgent assistance, and the deployment of insurer disaster response teams and ICA representatives to recovery centres when access is permitted by emergency services. The ICA has recorded more than 2,600 claims from the Victorian fires, with nearly half relating to commercial risks, including farming operations. When these claims are combined with other recent events, the council expects losses from declared weather catastrophes since September to exceed $2 billion nationally.
