The fire department said on Saturday morning that more than 300 firefighters were working in the area around Porto Germeno, about 70 kilometers northwest of Athens.
"At the moment there is no way to put out the fire. We are trying, but the wind is so strong," a person involved in the firefighting effort told AFP.
The fire broke out on Friday. Residents initially ignored calls from civil defence to evacuate, and around 300 people were later rescued by sea. Around 150 homes were reportedly damaged.
A warning of "extreme fire risk" has been issued for Saturday in Greater Athens, parts of the Peloponnese and Crete, central Greece and the border area with Turkey.
