Shipwreck Beach - surf spot statistics

Best Surf Season (December - February)

The heart of winter delivers the most consistent and powerful surf of the year. Average swell heights peak at 2.4m with long-period energy (12s+), fueled by the North Pacific storm track. The dominant NNW and NNE swells wrap effectively around the island, producing clean, hollow lines. Offshore winds from the north blow 22-26% of the time, creating prime conditions. While direct south swell is scarce, the sheer size and period of these northern pulses make for heavy, fast walls that are the highlight of the year.

Fair Surf Season (March, April, October, November)

The transitional months offer a mix of leftover winter power and early-season groundswell. March and April still see average heights around 2.1-2.3m, with periods in the 10-11s range, but the frequency of ideal offshore winds drops to 18-21%. October and November mark the return of consistent swell as autumn lows intensify, with heights climbing from 1.9m to 2.3m. The trade-wind influence is slightly less aggressive than summer, offering more windows of clean surf. Swell directions remain predominantly from the northern half of the compass.

Low Surf Season (May - September)

Summer brings the doldrums. Average swell heights fall to 1.7-1.8m and periods drop below 10s, resulting in weak, wind-affected surf. The persistent ENE trade winds blow over 50% of the time, generating choppy, cross-shore conditions. Ideal offshore wind days shrink to 11-20%, making clean waves a rarity. The swell that does arrive is mainly short-period easterly windswell, which lacks the power and organization to produce quality waves at this south-facing beach. This is the time for other activities or a crowd-free session if you can find a rare clean window.

September: The Turn of the Tide

Autumn arrives and the ocean begins to stir. Average swell height holds at 1.7m, but period lengthens to 9.9s – a meaningful improvement. Swell shifts slightly northward: ENE (32.5%) and E (36.3%) remain dominant, but NNE (5.7%) and even a touch of NNW (2.5%) reappear. These long-period pulses from the north indicate the resumption of the North Pacific storm track. Offshore wind odds jump to 23%, as the trade wind frequency drops to 64.7% for ENE. This means more windows of clean, offshore northerly flow. The waves are still on the small side, but now there is hope. September can produce surprising late-afternoon sessions when a north wind lines up the wrap-around swell. The quality is improving, and the consistency is building.