Crowds flock to the beach to escape the heat. Picture: Steve Ferrier/The West Australian

UPDATE Scraborough Beach surf life savers have been kept busy today rescuing about 130 beachgoers.

Wesfarmers Emergency Response Team had two jetskis patrolling Perth's beaches and spent about 4 hours at Scaborough Beach today where they rescued about 100 people.

At about 5.20pm today Surf Life Saving tweeted that police had been informed of a brawl at Scarborough Beach.

An estimated 20,000 flocked to beaches along Perths metropolitan coast as Swanbourne recorded 35.2C at 1.43pm.

Water conditions have been decribed as treacherous and there are a number of rips at beaches.

Club captain at Scarborough Surf Life Saving Club, Jody Ballard, reminded beachgoers not to drink and swim. He warned people that drinking and swimming can result in swimming and drowning.

The Surf Life Saving WA Westpac Lifesaver Rescue Helicopter was grounded this morning because of a mechanical fault.

SLSWA hired another helicopter to patrol metropolitan beaches this afternoon as engineers worked on the grounded chopper.

The helicopter has been patrolling over the weekend and is expected to do patrols between Yanchep and Mandurah and out to Rottnest daily, for up to four hours between 6.30am and 5pm.

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Chopper grounded as crowd flocks to beaches