Cottosloe - surf spot statistics

Cottesloe in Western Australia offers consistent surf conditions year-round, though the best months for surfers are typically from April to September. During this period, ground swell dominates (93–96%), with minimal wind swell interference (3–5%) and almost no flat days (0–4%). The mean swell size increases from 1.1m in April to a peak of 1.5m in July and August, providing solid, rideable waves. While wind conditions are less favorable overall (good winds only 25–32% of the time), offshore winds are most reliable in May (32% good conditions), making it a standout month. The winter swell energy is strongest, but the trade-off is worsening onshore winds (68–77% bad conditions). Early autumn (April) and late spring (September–October) offer a balance of decent swell (1.2–1.4m) before summer’s smaller waves (0.9–1.1m) and poor winds (16–23% good conditions) take over. Summer months (December–March) see slightly smaller swells (0.9–1.0m) and the worst wind patterns (77–84% bad conditions), making them less ideal. For surfers prioritizing size and consistency, June–August deliver the biggest waves, while April–May and September provide a sweet spot of manageable swell and slightly better winds.

October at Cottesloe offers decent surf conditions with a well-organized, mid-period swell averaging 1.2m and a solid 13.4s period, providing consistent energy for intermediate to advanced surfers. The dominant swell direction is WSW, accounting for the majority of rideable waves, particularly in the 0.5-1.5m range, with larger sets occasionally reaching 2.5m+. These swells are clean and well-groomed, favoring longer rides when paired with the right wind. However, only 21% of days see ideal offshore (easterly) winds, mostly light to moderate ENE-E, which keep the surface smooth. Unfortunately, the prevailing winds are more often from the S-SSW sector (10-30kph), creating choppy or cross-shore conditions that can disrupt wave quality. Smaller swells from SW-WSW are frequent but may lack power, while larger swells (1.5m+) are less common but offer higher performance potential for experienced riders. Windswell is negligible, keeping the lineup relatively pure groundswell. Timing sessions around lighter wind windows or early mornings is key, as afternoon seabreezes from the SW can degrade conditions. Overall, October delivers a mix of manageable surf with occasional high-quality days when swell, period, and wind align—best suited for surfers comfortable with variable conditions and occasional chop.