Black Rock - surf spot statistics

Best Surf Season (November - March)

During the Southern Hemisphere summer, Black Rock benefits from a higher frequency of offshore winds from the NNE to E quadrants, with the wind being ideal for surfing around 30-34% of the time. The trade wind regime sets up a consistent ridge of high pressure over the Tasman Sea, funneling clean easterly breezes across the point. While the swell direction remains far from optimal—dominated by E to SSE windswell—the combination of clean offshore winds and rideable 1-1.5m waves at 8-9s periods provides the most reliable surf. Don't expect perfect barrels; think fun, rippable, albeit sectiony waves.

Fair Surf Season (April - May and September - October)

The shoulder months see a transition in wind patterns. The offshore wind frequency dips to 23-29% as the subtropical ridge weakens and more frontal systems brush the region. Swell heights hold steady around 1.6-1.7m, with periods gradually increasing to 9-9.5s in autumn (April-May) as more S/SSE groundswells from Southern Ocean storms make their presence felt. However, these south swells arrive at a poor angle for Black Rock's SW-facing beach, often wrapping in with reduced energy. Wind conditions become more variable, with an increase in W to S winds that put the spot onshore. It's a gamble—catch a clean north-easterly morning and you can score some fun waves, but conditions deteriorate quickly.

Low Surf Season (June - August)

Winter is the low point. The frequency of ideal wind drops to just 16-22%. The dominant wind flow swings to the west and northwest as a series of strong cold fronts march across the Great Australian Bight. These west winds are onshore at Black Rock, creating messy, choppy conditions. While swell heights remain around 1.6-1.8m, the wave period is still 9-9.4s, but the swell direction focuses around S to SSE, which is not well aligned. The combination of onshore wind and poor swell angle results in mostly poor quality waves. If you're desperate, a rare high-pressure ridge can deliver a light NNE breeze and some S swell wrap, but it's the exception not the rule.

August: Glimmers of Spring

Ideal wind improves to 22% in August, a slight uptick from mid-winter. NNE (6.9%) and N (8.1%) winds become more common, but W (15.3%) and WNW (13.8%) still dominate. Swell directions broaden: S (16%) and SSE (14.8%) remain prominent, but NE (8.2%) and ENE (6.7%) start to reappear as spring approaches. The average height is 1.6m, period 9.0s. The wind and swell are still largely unfavourable, but the increasing frequency of north-easterly winds offers more clean windows. When the wind co-operates, some fun, punchy S swell can wrap in at waist-to-shoulder high. August is a month of anticipation—the low season is slowly turning.