I grew up in Nova Scotia and would say that May tends to be an iffy month. This last May was wet for half the month. June is quite consistent and would recommend at least late May or early June if possible. But the weather is good enough throughout May.
I would also recommend taking more than one day for the Cabot trail. There's plenty to see and you don't want to be rushed. 2-3days would be a good idea.
When on the Cabot Trail go camp at "Meat Cove" it's at the very tip of Cape Breton, it's a bit off the beaten path but it's worth it. The edge of the world.
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