A watch and act message is in place near Carrum Downs, with a bushfire not yet under control affecting nearby homes and residents being urged to leave.
Aerial images have shown at least one property's roof has caught fire, while a fence separating other houses has also caught fire.
Aircraft have water bombed one property that is already under threat.
Vic Emergency issued a warning just after 3pm on Saturday for Carrum Downs, Frankston North, Langwarrin and Skye about a bushfire at Blue Wren Rise, Carrum Downs.
10 fire crews are fighting the blaze, which is travelling in a southerly direction towards McClelland Drive.