Mangamanu - surf spot statistics

Best Surf Season (April - September)

Winter in the Southern Hemisphere fires up the South Pacific storm track, delivering the most consistent and powerful swell to Mangamanu. From April through September, average wave heights range from 1.7m to 2.0m with periods frequently exceeding 10 seconds, often reaching the powerful 10-14s bracket. Critically, the wind is ideal for surfing 58% to 78% of the time, with a dominant flow from the west, northwest, and north-northwest that blows cleanly offshore across the Southeast-facing beach. This combination of solid, long-period swell from the south and southeast and reliable offshore winds creates firing, rippable conditions day after day. Storms spinning up in the Roaring Forties send long-period groundswells that wrap into the bay, and when a high-pressure system settles in over the Tasman Sea, expect glassy mornings and pumping afternoon sessions.

Fair Surf Season (October - March)

Spring and autumn bring a transition in the synoptic setup. From October through March, the average swell height drops slightly to 1.5-1.7m, and the average period settles in the 9-10s range – still punchy, but lacking the raw power of winter. The percentage of ideal offshore wind falls to 43-58%, with more frequent interruptions from onshore easterly and southeasterly breezes that can chop up the surface. However, this season also sees a greater variety of swell directions, including occasional pulses from the optimal east and east-southeast quadrants that light up the point. When a cold front and post-frontal westerlies align, you can still score fun, clean waves, especially early or late in the day.

Low Surf Season (December - February)

During the height of summer, the surf takes a distinct step down. From December through February, the average wave height hovers around 1.5-1.6m, and the period drops to 9.1-9.8s – still rideable but often weaker and more inconsistent. The wind blows offshore only 43-48% of the time, with frequent afternoon sea breezes from the northeast and east that ruin the surface. Swell energy is lower, and many days are dominated by small, short-period windswell from the east and southeast. That said, a long-period south swell can still sneak in now and then, and if you pick your windows when a westerly wind blows, you'll find clean, fun-sized waves in the 0.5-1.5m range. It is not a total write-off, but patience is key.

May: Prime Time – Big, Clean, and Frequent

May is one of the top months at Mangamanu. Average swell height hits 1.9m with a period of 11.1s – long-period groundswell that packs a serious punch. The swell direction is heavily weighted toward the south (22.7%) and SSE (14.4%), but there is also notable input from SE (10.3%) and ESE (9.0%). Wave height distribution is epic: 1.5-2m (29%), 2-2.5m (22%), and even over 2.5m appears (0.4%). The wind is ideal a whopping 71% of the time, mainly from NW (16.8%), NNW (10.8%), and WNW (9.9%). Onshore eastern winds are scarce, making May a month of consistently clean conditions. The roaring forties spawn frequent, intense storms that send long-period swell across the Tasman. With the wind blowing offshore day after day, you can expect glassy mornings and groomed afternoon waves. This is the month to mark on your calendar.