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.

August at Cottesloe offers consistent surf conditions with an average swell height of 1.5m and a solid 14s period, providing well-spaced, powerful waves. The predominant swell direction is WSW (41.8% of waves in the 1-1.5m range), delivering clean, groomed lines ideal for intermediate to advanced surfers. SW swells also contribute, though less frequently, with slightly smaller but still rideable waves. Wind conditions are variable—only 25% of the time are they ideal (likely light offshore or cross-shore), but onshore winds (especially WSW to W) can disrupt sessions at higher speeds (20-30kph+). Larger sets (1.5-2.5m) occur but are less common, primarily from WSW and W directions. Expect smaller windows of cleaner conditions early mornings before winds pick up. Overall, August is decent for surfing here, prioritizing WSW swells with disciplined wind checks.