Westport Breakwater - surf spot statistics

Best Surf Season (June - August)

Winter roars to life across the Tasman Sea, and for Westport Breakwater, this is the window of greatest opportunity. The average swell height sits in the 2.4-2.5m range with periods often pushing 12-13s—solid, powerful groundswell generated by a constant stream of deep lows tracking east. While the dominant direction remains west-southwest, the relative uptick in north and northwesterly swell energy (peaking at around 7-8% of total occurrences) means the breakwater actually lights up on a more regular basis. This is paired with the best offshore wind consistency of the year: south to southwest winds blow clean and strong 47-52% of the time, grooming the occasional north swell into clean, hollow peaks. It's still a needle-in-a-haystack game, but when the alignment happens, you get long-period north swell with glassy offshore wind—that is when Westport Breakwater truly delivers.

Fair Surf Season (April - May & September - November)

These transitional months offer a mixed bag. Autumn (April-May) sees the Tasman still churning out plenty of energy—average heights hover around 2.3-2.5m with periods of 12.4s—but the swell direction is stubbornly stuck in the west-southwest quadrant. The north swell fraction remains small (around 6-7%), but the offshore wind is still favourable 47-50% of the time, so the few north pulses that do arrive can be excellent. Spring (September-November) brings a gradual decline in both swell size and wind consistency. The average height dips from 2.6m in September to 2.2m in November, while ideal offshore wind frequency drops into the high 30s (36-39%). Storms in the Tasman are less organised, and onshore northerly winds become more common, ruining the quality of what little north swell appears. However, the occasional deep low or tropical interaction can still produce a memorable north-northwesterly pulse with clean southerly winds—those are the days to watch.

Low Surf Season (December - March)

Summer and early autumn are the quietest months for the breakwater. The fetch from storms shifts poleward, and the Tasman settles into a more zonal west-east flow. Average swell heights drop to around 2.0-2.1m, and periods shorten to 11.3-11.9s—still rideable but lacking the punch of winter. The critical factor is the dramatic scarcity of north swell: the combined percentage from optimal directions (N, NNE, NW, NNW) bottoms out at just 5-6% of all swell occurrences. The vast majority of waves come from the west and west-southwest, which are effectively blocked or shadowed by the northern orientation of the breakwater. Offshore wind remains decent (38-48%), so the few north swells that sneak in during synoptic patterns like coastal troughs or cut-off lows can be clean, but they are few and far between. Most days you'll find knee-high windswell at best—better suited for a paddle than a proper surf.

November: Last Gasp of the Swell Season

November continues the autumn-like pattern. Average swell drops to 2.2m with a period of 11.6s. The north component holds at 6.5% (0.4% N, 0.6% NNE, 3.3% NW, 2.2% NNW). Wind ideal frequency is 38%, still low. The south and southwest winds that do occur are often strong (8-10% in the 10-30kph range), so when a north swell aligns, it can still get good. However, the overall downward trend in swell height and period means you're less likely to see powerful long-period groundswell from the north. The occasional tropical system or late-season cutoff low can throw a surprise north-northwesterly swell, but these are the exception. November is for the optimist.