Sydneysiders are already sweltering - but it is only going to get toastier.

Temperatures had soared to 30 degrees by 9.30am on Saturday and the mercury was expected to continue to climb to 36 degrees in some parts of the city.

Sunlovers are expected to make the most of Saturday's warm weather. Credit:James Alcock

Bureau of Meteorology forecaster Jake Phillips said the weather in the city was well above the average maximum for November of 24 degrees.

"We are expecting some showers and possibly some storms to develop in the afternoon. A cooler change will be coming through, that will be really noticed in the evening that will offer some relief," Mr Phillips said.