By Xmas we're out most days of the week... as Ewan said... IF it's a good season,
but you'll get at least a couple of days a week on the water even if it's an average season.
Mornington Peninsula; head to Balnarring Beach in Western Port Bay for the summer southerly seabreezes.
Port Phillip Bay, anything in the upper half of the bay where the S/SE seabreeze works, usually from ~Carrum and up.