Around 5000 households are still without power after a ferocious storm swept through Sydney and the Illawarra.

The storm on Tuesday night generated damaging winds and hailstones after NSW kicked off summer with a scorcher, with temperatures in the high 30s and early 40s.

At the peak of the storm, 21,500 households lost power as trees fell over, bringing down powerlines.

The bulk of affected customers are in the Hawkesbury region and there are also isolated pockets of outages in the Blue Mountains and western Sydney.

Crews from Endeavour Energy will work on Wednesday to restore power to customers as quickly as possible.

People are being warned to stay at least eight metres away from fallen power lines and report them immediately by calling 131 003.

The damaging winds and lightning caused more than 300 electrical hazards across a broad area.


Many of those who lost power also were also affected by Sunday’s windstorm when the state sweltered through a weekend heatwave.

Meanwhile, most NSW residents will enjoy significantly more pleasant weather on Wednesday, with temperatures across Greater Sydney unlikely to break 30C.

The warmest weather in NSW will be felt in the northern tablelands, including Inverell, and the northwest slopes and plains, including Tamworth, Moree, Narrabri and Wee Waa.

The northern slopes and northwest districts are subject to a total fire ban.

Meteorologists are tipping the mercury to begin rising again on the weekend.

“Temperatures (will be) starting to creep up again around Saturday, just ahead of the next cold front that will be making its way through,” Bureau of Meteorology forecaster Alex Majchrowski told reporters on Tuesday.



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