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Conditions at Rottnest Island in April
April: The Autumn Window Starts to Open
April is when Rottnest Island starts to remember how good it can be. The average swell height climbs to 6-7ft (2.0m) and the period holds at 12.7s, producing more consistent, longer-period groundswell. The directional spread becomes more westerly as WSW jumps to 10.8% and SW hits 52.0%, while pure SSW drops to 15.1%. This is important because the wind distribution finally shifts: S and SSW winds drop to 26.3% combined, and the N to NW offshore quadrants become noticeably more frequent. Ideal conditions jump to 11%, the highest of the year so far. Average air temperatures cool to 20.5°C, water remains warm at 22.5°C, and rainfall increases slightly to 1.00 mm/day. With more offshore wind windows and punchy, long-period waves, April becomes a serious contender for the best balance of quality and warmth.
Average Spot conditions at Rottnest Island in April
Swell history for April
Wind history for April
Swell quality
Analyze the groundswell consistency at Rottnest Island during April. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Rottnest Island for your next trip in April.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Rottnest Island for April. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Rottnest Island.