Great Barrier Reef

Summer (Dec–Feb): Hot, humid, and wet with highest rain and cyclone/stinger risk (Nov–Apr). Water is warm; visibility can be poor. Off-peak prices, fewer day-trip options during storms. Autumn (Mar–May): Post-wet shoulder season — decreasing rain, warm water, improved clarity. Fewer crowds and better deals; good compromise. Winter (Jun–Aug): Cool, dry, sunny — best visibility and calm seas. Peak season for tourism; book ahead. Humpback whale migration begins (Jun–Oct). Spring (Sep–Nov): Warming, excellent clarity, and fewer people than winter. Key events: turtle-nesting season (Nov–Mar) and the spectacular coral spawning, typically after the full moon in November. Overall: winter for best diving conditions, spring/autumn for fewer crowds and seasonal wildlife, and summer only if you prioritize warm water and lower prices while accepting weather risks.