Prosper in a dynamic world
Search

Severe heatwave takes hold of NSW

A relentless five-day run of oppressive heat is impacting NSW, with some towns in the state expected to see the warmest run of November days in 15 years.  

The prolonged period of heat began on Saturday for western Sydney, with Penrith reaching 35.3°C on Saturday and 37°C on Sunday, with the mercury set to soar into the high 30s to low 40s for the next three days.  

A blocking high pressure system centred near New Zealand is directing warm northerly winds over eastern NSW in the coming days. 

A severe heatwave warning has been issued for parts of the Hunter, western Sydney, the Illawarra and South Coast district of NSW, as a prolonged run of warm days and nights impacts the districts.  

Image: Heatwave severity forecast for the three days from Monday, November 25. Source: BOM 

Several towns across NSW will experience the hottest November four-day spell in 15 years beginning on Monday, November 25, including Cowra, Gundagai, Parkes and Gunnedah, while for Richmond in Sydney’s west as well as Maitland and Singleton in the Hunter it’s been 10 years. 

Maximum temperatures along coastal Hunter and Sydney districts will reach the low to mid 30s with cooling seabreezes forecast for each of the next three to four days, while the west will soar into the high 30s. Meanwhile the Illawarra, Southern Tablelands and South Coast districts in the warning above should reach the low 30s during this period. 

Unfortunately, this heat will be combined with uncomfortably humid conditions, which will make the temperatures feel around 1 to 3°C hotter than the actual temperature. 

The hottest day of the run should be Wednesday, ahead of thunderstorm activity and cloud cover forecast on Thursday. The map below shows central areas of NSW that will see the peak of the heat, particularly western Sydney where temperatures could soar into the low 40s.  

Image: Maximum temperature forecast for Wednesday, November 27 

Meanwhile minimum temperatures across eastern NSW will reach the high teens to low 20s during the next 5 to 7 days, with Sydney’s temperature forecast to only drop to 23°C early Thursday morning.  

There is relief in sight with temperatures forecast to drop into the low to mid 20s across NSW on Friday and into the weekend as an upper-level low pressure system generates cloud, rain and thunderstorm activity across the state.  For detailed forecasts on the heat and humidity please visit our website or email us at sales.apac@dtn.com.

Title image credit: iStock / SCM Jeans 

Latest news

Satisfy your weather obsession with these news headlines from around the nation, and the world.

Rapid El Niño signal accelerating risk for Australian businesses

El Niño–favourable conditions are gathering pace across the tropical Pacific, with key ocean indicators approaching threshold levels and early atmospheric responses emerging.  While uncertainty remains around final El Niño strength, historical analogues show that even weak events can generate widespread impacts, including reduced rainfall, warmer daytime temperatures, increased frost risk, elevated fire danger, reduced tropical cyclone activity, and more. Industries including […]

Australia’s 2025–26 Cyclone Season: Slightly Above Average, Dominated by Severe Systems

Australia has just experienced a highly impactful tropical cyclone season, with more than 60% of systems reaching severe intensity, causing widespread disruption and damage to communities and multiple industries across northern Australia.  The 2025–26 Australian tropical cyclone season officially ran from 1 November 2025 to 30 April 2026. During this six-month period, Australia saw 11 tropical cyclones, with nine […]

What does a ‘super El Niño’ mean for Australia’s businesses?

There are signs that a very strong, or ‘super’ El Niño could develop in the tropical Pacific Ocean later this year. So, what does this mean for Australia’s weather during the second half of 2026? El Niño on the horizon The tropical Pacific Ocean is currently in a neutral state, meaning neither El Niño nor […]

How does DTN help businesses monitor bushfire induced pyrocumulonimbus thunderstorms that ignite more fires?

Intense heat from bushfires during elevated fire danger days can trigger fire-induced pyrocumulonimbus thunderstorms that ignite additional fires. In early January 2026, an extreme heatwave sweeping over southeastern Australia brought catastrophic fire danger to Victoria. Intensely hot bush and grass fires spread erratically and quickly in hot, dry and gusty winds, with pyrocumulonimbus generating lightning, […]