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.

January: Peak Summer Lulls and Offshore Windows

January sits in the heart of the Kiwi summer, with an average swell height of only 1.5m and an average period of 9.4s. The dominant swell direction is from the south (18.0%) and SSE (13.3%), which is slightly off the optimal east-to-southeast window, but still wraps in reasonably well. East and ESE swells also contribute over 22% combined, providing the best shape when they arrive. Wave heights most often fall in the 1-1.5m (62% of total) and 1.5-2m (29%) range – fun-sized but not heavy. The wind is ideal for surfing just 45% of the time, with the bulk of offshore flow coming from the NW (8.8%), W (3.2%), and NNW (6.7%). However, onshore winds from the NE and ENE are common (17.5% combined), bringing bumpy conditions. Persistent summer high pressure often results in light morning breezes, but the sea breeze kicks up by midday. The best bet is an early session with a fading south swell and a light westerly stream.