And that's a given.

The Bureau of Meteorology has forecast a 100 per cent chance of rain falling across the colour city on Saturday, before more rain is again expected to fall on Sunday.

As much as 10 millimetres could fall on both days.

The mercury will max out at 12 degrees Celcius on Saturday before gradually dipping, hitting just six degrees on Monday and Tuesday.

And while not a 100 per cent forecast, snow is predicted to fall on higher parts of the region, with Mount Canobolas to receive a dusting on Monday, continuing into Tuesday too.

The Jenolan Caves region will likely enjoy snow to kick-start next week as well.

Further rain will add to the city's continually increasing water supply, with the combined storage of Suma Park and Spring Creek dams at 26.24 per cent as of Friday afternoon.