Vic Crib Point contained by fire crews

A fierce bushfire that destroyed one home and damaged a second on Victoria's Mornington Peninsula has been contained.

The fire, which threatened Crib Point, southeast of Melbourne, broke out soon after 4.30pm on Monday.

A garage and two sheds were also lost as flames tore through a foreshore reserve near the HMAS Cerberus naval base.

"One lady in her late 70s jumped into a nearby creek and stayed in there to look after herself as the fire approached," a State Control Centre spokesman told AAP.

"She got out of there and went to the beach, where the volunteer coast guard picked her up."

The woman was unharmed, but it's not yet clear if her house was the one destroyed by the fire, the spokesman said.

A watch and act warning remains in place, with a crew of about 50 firefighters to work through the night blacking out hot spots and using bulldozers to build mineral earth breaks around sections of the fire ahead of worsening weather on Tuesday.

Crib Point residents have been told that staying close to shelter is their safest option in case conditions change again.

The bushfire blackened about 80 hectares.

The origin of the fire is not known.