Storms lessen but Vic not yet in the clear

It's been wild ride for Victoria the past two days, and forecasters say there could be more thunderstorms on Sunday.

There will be some relief for Victorians on Sunday after the state was hit by storms in recent days. (AAP)

After a wild two days of heavy rain and flash flooding in Victoria, most areas had some relief overnight.

However, parts of Gippsland including Morwell, Traralgon experienced downpours on Saturday evening and the Bureau of Meteorology warned thunderstorms across the state could be on the cards for Sunday.

Mallacoota in Victoria's far southeast recorded 70mm of rain between 5pm and 6pm Saturday.

Flash floods in parts of outer metropolitan Melbourne caused havoc, turning backyards, suburban streets and ponds into gushing rivers.

A Christmas party at a Pakenham housing estate was called off Saturday afternoon when heavy rainfall halted celebrations.

Organiser Samantha Thorpe said a little pond nearby became "like a raging river".

Emergency Management Commissioner Andrew Crisp said few parts of the state had been spared the impact of the wild weather.

In the 24 hours from 7am on Friday the SES received 693 requests for assistance across the state.