The Bureau’s latest outlook
The Bureau of Meteorology’s October to December outlook points to above-average daytime temperatures across most of Australia and above-average overnight temperatures across almost the entire country. It also flags an increased chance of unusually warm days across much of the southern two-thirds of the continent, raising the risk of heatwaves as the warmer season develops.
Warm nights are a major part of the risk
Heatwave danger is not only about maximum temperature. When nights stay unusually warm, homes and bodies have less time to cool down. The Bureau says the chance of unusually high minimum temperatures is exceptionally high across much of Australia, making overnight heat an important part of summer preparedness.
| Outlook signal | October–December 2026 |
|---|---|
| Daytime temperatures | Above average across most of Australia |
| Overnight temperatures | Above average across almost all of Australia |
| Rainfall west/central | Often above-average odds |
| Rainfall south-east/far north | Below-average signal in some areas |
| El Niño | Expected to strengthen further |
| Marine heatwave risk | Elevated, especially around south-eastern waters |
Rainfall is not a simple national drought story
The rainfall outlook is mixed. Much of western and central Australia has increased odds of above-average rainfall, while parts of Victoria, Tasmania and the far north lean drier. This is why the Bureau cautions against reading El Niño as a single nationwide rainfall outcome.
What strong El Niño does — and does not — tell us
The Bureau says the current El Niño is strong and may become the strongest in the reliable record, but strength does not map directly onto impact. Other climate drivers, including the Indian Ocean Dipole, regional sea-surface temperatures and local weather systems, also shape rainfall and temperature.
Fire weather risk still matters
Hotter conditions can dry fuels faster, especially where rainfall stays below normal. The Bureau noted that warm and dry September conditions already elevated fire danger in many parts of the country. Fire risk through spring and summer will depend on the combination of heat, wind, recent rainfall, fuel moisture and local vegetation.
Marine heatwaves are another concern
Sea-surface temperatures are forecast to warm around Australia, particularly in some southern waters. Warmer seas can stress marine ecosystems and also supply more moisture and energy to weather systems. That can increase the potential for intense rainfall when the atmospheric setup is favourable.
What households should prepare for
- Check local heatwave forecasts rather than relying only on national outlooks.
- Prepare cooling plans for hot nights as well as hot afternoons.
- Review bushfire plans in fire-prone areas before severe fire weather arrives.
- Track rainfall outlooks by state and region because the national pattern is mixed.
- Check on vulnerable family members and neighbours during prolonged heat.
Bottom line
Australia is heading into a warmer-than-normal period with a higher risk of heatwaves, but the rainfall picture is regionally mixed. The strongest message from the Bureau is not simply 'El Niño equals drought'. It is that heat risk is widespread, rainfall outcomes vary sharply by region, and local forecasts remain essential.