www.aksa.com.au/ try this link and surf around. Adelaide generally gets a 15-25knot seebreeze most days of summer unless a northerly is blowing,and this results in light afternoon winds as one cancels out the other, opposing southerly seebreeze.
www.seabreeze.com.au/graphs/sa.asp This link is also good for checking waves and wind. I reckon our climate and wind is very similar to Perth. Hope this helps!