...several times under similar conditions and have been fine with a tee shirt and shorts. Once there was a period of about 36 hours of light rain. For that I used a breathable top with a hood (temp dropped to mid 60s). However each time I was with a group and we were never far from land.
Great place to camp as you can usually set up on rocks and not have to deal with mud on those rainy days.
BTW, if you decide not to solo it, check out Black Feather (out of Parry Sound). They do a bunch of trips in that area. I know that I would not try that area by myself as navigating the maze of islands is beyond my skill set.
Kayak & Canoe Outriggers
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