A "zombie cyclone" that is reviving into a powerful storm, thunderstorms threatening Sydney and the east coast and another scorching start to a Test match will be among the highlights of wild early summer weather.

The next few days will be an "extreme weather week," Senior Weatherzone meteorologist Brett Dutschke said.

The coming week will bring a combination of storms, cyclones, humidity and sun. Credit:Nick Moir

Sydney is likely to see mild to severe thunderstorms that may result in flooding in some areas.

It is unlikely the wet weather will mirror the wild rain that Sydney battled last month, much to the relief of many residents.