Hi Tom,
You’re right it will be pretty warm around Perth during that time. Blackwall Reach is pretty popular on the warmer days, no pad needed as it’s over water.
Around Perth will be a bit limited as it’s the ticks are out. Down south around Margaret River is pretty good if you can organise a pad and head down that way. Sorry but not aware of anyone headed down over those weekends, the indoor gyms might be a good place to check.
Cheers,
B.