Green Island - surf spot statistics

Best Surf Season (June – August)

As winter tightens its grip on the Southern Hemisphere, the Tasman Sea roars to life. The combination of strong frontal systems sweeping up from the Southern Ocean and a steady ridge of high pressure to the south funnels consistent, long-period S to SSE swells directly into the island's southeast-facing setup. Offshore flow from the prevailing NW to NNW winds becomes the norm, with ideal wind percentages peaking near 53% in July. This is Green Island at its finest – pumping, glassy, and firing.

Fair Surf Season (April – May & September – October)

The transitional shoulder months bring a mixed bag. Swell direction already favors the SE quadrant, and average heights hover around a solid 1.6-1.7m with periods stretching into the 8-9s range. However, the wind regime is more fickle – while offshore breezes dominate a decent chunk of the time, lingering onshore S to ESE pulses can chop up what would otherwise be pristine lines. Expect fun, rippable waves with occasional windows of perfection when a high-pressure system parks itself overhead.

Low Surf Season (November – March)

The summer months see a downturn in both swell quality and wind consistency. The storm tracks retreat poleward, leaving behind a diet of short-period, weaker E to NE swell that rarely aligns with the spot's optimal SE exposure. On top of that, the trade wind influence strengthens, with persistent ESE to S onshore winds ruining the groomed face. While the odd pulse from a tropical depression or a late-season cold front can salvage a session, the general rule of thumb is smaller, choppier and less reliable surf.

September: Spring Transition – Consistency Fades Slightly

September marks the beginning of spring, and the surf quality starts to become more inconsistent. Average swell height holds at 1.6m, but the period drops to 8.7s. Offshore wind percentage is still a respectable 50%, but the direction is more variable. The dominant swell directions are still S (16.5%) and SSE (16.4%), but the energy is less reliable as storm tracks begin to retreat. The wind roses show increasing frequency of E and NE winds, which are offshore but often weaker. The good news: when a late-season cold front pushes through, it can still generate excellent, long-period S swell with offshore NW winds. Expect a mix of clean, fun days and smaller, weaker spells.