Power still out

Eastern NSW, meanwhile, has continued its clean-up after days of turbulent weather.

As of Sunday afternoon, the State Emergency Service had received almost 3,800 requests for assistance in the aftermath of Saturday night's storm, mainly for fallen trees and roof damage.

The SES was still receiving new requests for assistance, though, with many from the Hills, Hornsby and Parramatta.

Saturday night's hail and heavy rains brought trees and power lines down, with 110,000 homes losing electricity and Sydney's north-west suffering the most damage.

More than 30,000 homes and businesses were still without power on Sunday evening and some might be waiting until Wednesday for it to be restored.

"We haven’t seen this extent of damage in these areas in recent times,” Sam Sofi, an Ausgrid manager, said.

Conditions to improve

Monday should see conditions settle, with a mostly sunny day forecast for the city and a top of 29 degrees. Western Sydney will see temperatures reach the mid-30s, the bureau said.

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Sydney could see a shower or two during the day, but the bureau said it looks like storms will be confined to the Hunter region.

Showers will be a feature of most days this week, with Thursday likely to see the peak of the heat. Sydney can expect 32 degrees - and western suburbs as high as 36 degrees - before conditions cool off again.