Bluebottles [Portugese men of-war] choose this season to visit, particularly if there's an onshore breeze. Warnings will be posted, but locals generally disregard the chance of a close encounter with a few painful nematocysts. Part of the Australian deal, battling nature tooth and claw, but rent a wetsuit if you want to surf with protection.
North East Coast [Cairns & Great Barrier Reef islands]: all year is hot [above 26C] but Jan-March gets some rain and cloud while December-January is crowded and super heated, so April-November is best for swimming. Scuba divers like September-December.
South West [Perth] Best September-November, March-May.
North West [Exmouth, Ningaloo Reef, Broome, Kimberley] Best May-October.
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