Margaret River - surf spot statistics

Best Surf Season (May - September)

Winter in the Southern Ocean unleashes its fury and Margaret River goes full-pumping. From May through September, the average swell hovers around a solid 2.3m to 2.8m, with periods consistently in the 12.9-13.3s range – that's powerful, long-period groundswell that wraps perfectly into the West-South-West facing coastline. The dominant swell directions shift to SW and WSW, the exact sweet spot for this stretch of coast. While onshore westerlies can be a menace, the prevalence of E to NE winds during high-pressure setups offers clean, glassy conditions especially in the mornings. This is prime time for pumping 1.5-2.5m plus waves at iconic spots like The Box and Mainbreak.

Fair Surf Season (April & October)

Shoulder months bring a transition period where the ocean is still very much alive. April and October see average swells between 2.0m and 2.2m with periods around 12.8-12.9s – solid and rippable. Wind ideal percentages climb to 29% in April thanks to more frequent easterly regimes, while October cools off slightly. These months can deliver fun, clean waves without the peak-winter crowds, making them a favorite for those seeking quality over quantity.

Low Surf Season (November - March)

Summer settles in and the Pacific High-pressure system dominates the Indian Ocean, suppressing the storm track. From November through March, average swell heights drop to 1.8-1.9m and periods slip to 11.8-12.5s. While still rideable, the swell tends to be more windswell-infused and less consistent. The wind regime is dominated by afternoon sea breezes – SSE to SW onshores that wreck wave quality. However, early morning offshore easterlies from the land breeze can still create short windows of fun, groveling waves in the 0.5-1.5m range. March stands out as the best of the low season with 21% ideal wind and longer average periods (12.5s), hinting at the approaching winter swell.

August: Still Firing, Slightly Mellowing

August remains in the heart of winter with an average swell of 2.7m and a period of 13.3s – still very powerful. The swell direction stays SW (25.6%) and WSW (14.0%) focused, with a slight decrease in the westerly component. Wind ideal percentage dips to 18% as westerly winds (W 11.2%, WNW 11.7%, SW 10.0%) become even more dominant. The offshore wind windows are narrower – often only a few hours in the early morning before the westerlies kick in. When conditions align, the waves are heavy, firing in the 2-2.5m range, with overhead barrels at the reef breaks. August is for the dedicated local who knows the morning spots. The quality is there, but you have to work for it.