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.

August: Still Pumping, But Signs of Shift

August keeps the winter momentum rolling. Average swell height is 1.6m, period 9.1s, and offshore wind percentages remain high at 52%. The swell direction is still dominated by SSE (14.8%) and S (16.0%), but there is a noticeable uptick in NE and ENE swell – a hint of spring approaching. Winds remain favorable, with WNW and NW combining for over 30% of total. The surf is still very good, with plenty of 1-2m S swell wrapping in cleanly. As the month progresses, the occasional N swell from distant tropical lows can add variety, but the bread and butter remains the consistent S groundswell. A great month with fewer crowds than July.