A Strong El Nino Is Intensifying, Here’s What It Means For Sydney This Summer

This article is updated regularly as new information comes in.

After months of speculation about a potential “super El Nino”, the climate driver is now firmly established—and NSW authorities are preparing for a potentially challenging bushfire season.

The Bureau of Meteorology says the current El Nino is already strong and likely to intensify further during spring, with forecasts pointing towards a very strong event that could persist into autumn 2027.

For Sydney, this raises the likelihood of warmer days, reduced rainfall and heightened fire danger through spring and into summer—particularly around the city’s bushland fringes.

Jump to:

• Is Australia In El Nino In 2026?
• What Does El Nino Mean For Sydney?
• Will Sydney Have A Hotter Summer In 2026?
• Will El Nino Increase Sydney’s Bushfire Risk?
• How Is NSW Preparing For The Bushfire Season?
• When Does The NSW Bushfire Danger Period Begin?
• Is A “Super El Nino” Guaranteed?

Is Australia In El Nino In 2026?

Yes. El Nino is now firmly established, with both ocean and atmospheric indicators reflecting a strong event.

The relative Nino 3.4 index, which measures sea surface temperatures across a key section of the tropical Pacific, reached 2.2°C above average for the week ending 9 August—well beyond the Bureau’s El Nino threshold of 0.8°C.

All international climate models surveyed by the Bureau expect the tropical Pacific to continue warming through spring, with the event likely to peak in late spring or summer and persist into autumn 2027.

While forecasts currently point towards a very strong El Nino, the Bureau stresses that the strength of the ocean temperatures does not automatically determine the severity of its impacts in Australia. Other climate drivers and individual weather systems will continue to shape conditions.

What Does El Nino Mean For Sydney?

El Nino events typically bring lower winter and spring rainfall to eastern Australia, alongside higher daytime temperatures across southern parts of the country.

For Sydney, that could mean fewer extended stretches of grey, drizzly weather and more clear, dry days through the remainder of winter and spring.

Daytime temperatures are also more likely to sit above average, with hotter conditions potentially becoming more pronounced as summer approaches—particularly across Western Sydney.

However, below-average rainfall does not mean Sydney will remain completely dry. Individual weather systems, including east coast lows, can still bring periods of heavy rain during an El Nino.

Will Sydney Have A Hotter Summer In 2026?

Current forecasts indicate an increased likelihood of above-average temperatures across NSW as the state heads towards summer.

Warmer and drier-than-average conditions during autumn have already left many parts of NSW unusually dry, with some regions experiencing drought.

If those conditions persist, fire activity could increase through spring and into the 2026–27 bushfire season.

For Sydney, the combination of warmer temperatures, reduced rainfall and drying vegetation may become particularly significant around the Blue Mountains, Hawkesbury, Northern Beaches and southern bushland areas.

Will El Nino Increase Sydney’s Bushfire Risk?

El Nino is typically associated with increased fire danger across southeast Australia, but it is only one factor influencing bushfire conditions.

The NSW Government says the state faces a high potential for a challenging summer, with above-average temperatures and below-average rainfall forecast. Several years of significant rainfall have also driven vegetation growth, creating additional fuel as conditions dry out.

That does not guarantee severe bushfires in or around Sydney, but it increases the importance of preparation—particularly for communities adjoining national parks and bushland.

Greater fire activity around Sydney’s outskirts can also affect the wider city through smoke haze and reduced air quality, even when fires are burning some distance from the CBD.

How Is NSW Preparing For The Bushfire Season?

The NSW Government has convened a Hazard Reduction Roundtable, bringing together the Rural Fire Service, Fire and Rescue NSW, National Parks and Wildlife Service, Forestry Corporation of NSW, Crown Lands and other agencies.

Since 1 July 2025, hazard reduction work has been completed across more than 124,000 hectares of public and private land, helping protect more than 174,000 properties. That is over 20 per cent more land than was treated across the previous annual period.

More than 75,000 hectares were treated between April and July alone under Taskforce Fire Guard, a multi-agency program established to improve coordination between emergency services and land managers.

Authorities are continuing planned hazard reduction work through spring, although unpredictable weather is narrowing the windows in which burns can safely take place.

When Does The NSW Bushfire Danger Period Begin?

The official Bush Fire Danger Period begins across most of NSW on 1 October 2026, although some northern areas have already entered the period.

During the Bush Fire Danger Period, landowners generally need a fire permit before lighting a fire. Restrictions can begin earlier or be extended in individual council areas depending on local conditions.

Anyone living near bushland should check their local arrangements through the NSW Rural Fire Service and prepare or update their bushfire survival plan before summer.

Is A “Super El Nino” Guaranteed?

“Super El Nino” is not an official Bureau classification, although it is commonly used to describe an exceptionally strong event.

Current modelling indicates this El Nino could peak at ocean temperature levels exceeding the warmest recorded since 1950. However, that does not guarantee Sydney will experience record heat, drought or catastrophic bushfires.

The Bureau notes that a strong El Nino signal in the tropical Pacific does not necessarily produce equally strong weather impacts across Australia. Rainfall and temperatures will also be shaped by the Indian Ocean Dipole, the Southern Annular Mode, surrounding ocean temperatures and individual weather systems.

For now, the clearest signal is that Sydney and NSW are heading towards a warmer, drier spring with an increased risk of challenging fire conditions.

We’ll continue updating this article as the summer outlook becomes clearer. Read the latest updates via the Bureau of Meteorology and NSW Government.

Main image credit: Annie Hatuanh