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Conditions at Cottosloe in December
December: Summer Doldrums - Smaller Swell and Daily Seabreeze
December marks the official arrival of the Cottosloe summer low season. Average swell drops to 1.9m (6.2ft), period shortens to 11.7s, and the directional focus swings hard to the SW (48.1%) and SSW (28.8%) - the least favourable angle for this west-facing break. The ideal wind percentage bottoms out at 25%, with SSW (25.4%) and S (14.3%) winds dominating the daily pattern. This creates a classic summer regime: plenty of south-west swell but almost constant onshore/cross-shore winds shredding the surface. Water temp is warm at 21.0°C, air averages 21.3°C, and rainfall is minimal at 0.34 mm/day. It's a great month for a swim and a longboard cruise, but serious wave riders should hold out for the late afternoon intervals when the sea breeze finally relaxes.
Average Spot conditions at Cottosloe in December
Swell history for December
Wind history for December
Swell quality
Analyze the groundswell consistency at Cottosloe during December. 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 December.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cottosloe for December. 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.