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Conditions at Cottosloe in May
May: Golden Month - Big WSW Swell Meets the Best Offshore Winds
May is arguably the best month on the Cottosloe calendar. The average swell height climbs to 2.2m (7.2ft) with a solid 12.7s period, but the real headline is the direction mix: the optimal WSW sector jumps to 16.0%, W to 3.7%, WNW to 1.4%, creating a far more direct angle onto the beach. SW still supplies 42.1%, but the added western component makes for longer, cleaner walls. Winds align beautifully - ideal offshore conditions occur 48% of the time, the highest of the year. ENE (10.8%), E (11.7%), and NE (7.2%) keep the surface silky smooth for many sessions. A little more rain (2.88 mm/day) comes with the strengthening frontal systems, but the drop in water temp to 20.7°C is a small price for such consistent, high-quality surf. This is the month to book your sickie.
Average Spot conditions at Cottosloe in May
Swell history for May
Wind history for May
Swell quality
Analyze the groundswell consistency at Cottosloe during May. 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 Cottosloe for your next trip in May.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cottosloe for May. 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 Cottosloe.