Treacherous surf conditions have seen hundreds of people rescued at Perth beaches as temperatures climbed into the mid 30s and thousands flocked to the sea.

Surf lifesavers were kept busy throughout with more than 200 individual rescues at Scarborough Beach alone.

In one situation, lifesavers had to launch a mass rescue as about 10 people got caught in a rip at Scarborough.

Scarborough surf life saving captain Jody Ballard says that despite the high number of rescues there have been no serious injuries.

"Just getting out to people as quick as we can and getting them back to shore safely," he said.

"No major injuries, no spinals, no near-drownings, so really a great day on the beach to start the summer with, albeit with a lot of rescues."

Surf Lifesaving says rescue jet skis were busy pulling people from the water as they got caught up and down the coast.

In an out-of-water incident, police were called after a brawl at Scarborough Beach involving a large number of people.

It is understood dozens of people started fighting on a grassy area above the beach.

Meanwhile, Surf Life Saving WA had to ground its shark patrol helicopter on the first day of its season due to mechanical issues.

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More than 200 rescued from rips at Perth beach