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.

June: Deep Winter – Peak Season Arrives

June is the heart of winter and Green Island's best month. The average swell height reaches its annual peak of 1.8m, with a period of 9.4s. Offshore wind percentage is 49%, still high, and the wind direction is dominated by W to WNW flow – perfect offshore conditions. Swell direction is split between SSE (15.6%) and S (16.2%), plus a growing contribution from SW (3.5%) which wraps in nicely. This is the month when 1.5-2.5m sets become common, and the reef or sandbank can produce long, grinding walls. The combination of strong, long-period S swells and consistent offshore breezes creates the most reliable surf all year. Keep an eye on the Southern Ocean storm track – when a deep low cranks, Green Island delivers XL barrels.