Sydney's long, hot summer shows no sign of wavering in its final days, bringing with it some unwelcome guests.

Beachgoers who head to the coast to make the most of the last weekend of summer can expect sunny skies and warm temperatures, as mild weather heats up in coming days.

Blue bottles cover the shore at North Bondi Beach as the last weekend of summer approaches. Credit:Jessica Hromas

However they have also been warned to look out for bluebottles, with lifeguards at North Bondi dodging big waves, as well as armadas of the creatures strewn across the sand this week.

Weatherzone meteorologist Kim Westcott said north-easterly winds sweeping through the city would keep a lid on hotter temperatures in the city, but the west was set to swelter.