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.

In May, Cottesloe typically offers decent surfing conditions with an average swell height of 1.2m and a solid period of 13.7s, indicating consistent, well-spaced waves ideal for intermediate to advanced surfers. The primary swell direction is predominantly from the WSW, accounting for the majority of rideable waves, especially in the 0.5-2.5m range. Smaller contributions come from SW and W swells, but WSW swells dominate, producing the best quality waves, particularly in the 1-1.5m and 1.5-2m ranges. Wind conditions are favorable 32% of the time, with light to moderate ENE-E winds being the most common offshore flow. However, stronger SE-SSW winds can create choppy conditions, particularly when exceeding 20kph. Overall, May delivers reliable, mid-sized surf with clean conditions on ENE-E wind days, but wind variability means timing sessions around morning or late afternoon windows often yields the best results. Not huge, but consistent and fun for experienced surfers.