The best time to visit Cape Barren Island is during the warmer months, specifically from December to March.
This period offers the most pleasant weather for exploring the island. You'll find warmer temperatures, less rainfall, and calmer seas, which are ideal for outdoor activities like hiking, fishing, and boating. It's also when the island's unique flora and fauna are most active.
For those interested in birdwatching or nature photography, this timeframe is particularly good. Many migratory birds are present, and the island's landscapes are at their most inviting.