Perth's wild winter weather has put footpaths and carparks at Fremantle's Port Beach in serious risk of collapse, prompting the council to close off the access to the local beach and surrounding areas.

The strong winds and stormy seas on Thursday night caused significant erosion to the sand dunes located next to the beach's southern carpark, surf club annex and public change rooms.

Perth's wild winter weather has prompted the City of Fremantle to close off access to Port Beach, after footpaths and car parks were identified as being at serious risk of collapse.

"With more stormy weather forecast over the weekend it's possible the erosion could get worse, so we've taken the step of closing access to Port Beach, including Sandtrax Beach, as a safety precaution," City of Fremantle Acting Chief Executive Officer Glen Dougall said.

Mr Dougall said footpaths and other adjacent sections of coastline had also been barricaded and closed to the public.