Well, I have no direct or expert info, but it does have a majo r ocean in its back yard!
Lonely Planet:
City Beaches
Perth has some of the the best city beaches in Australia, though they can get a bit unpleasant and windy in the afternoon. There are calm bay beaches on the Swan River at Crawley and Peppermint Grove, or you can try a whole string of patrolled surf beaches on the Indian Ocean coast, including Perth's very popular nude beach at Swanbourne. Scarborough is known for its beachside cafe society, and is great for experienced surfers and sailboarders. Perhaps the best beach of all is on secluded Carnac Island, frequented by the odd marooned human and some sea lions.
This appears to be some surfing type stuff:
surf info
More surfy stuff
Huge amounts of Perthy surfy stuff
Yet more surfy Perthy stuff
There - someone who really knows may come along.
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Good to see ya packing rat again, Roger.
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