Mangamanu - surf spot statistics

Mangamanu in New Zealand offers surfable conditions year-round, with seasonal variations in swell quality and wind patterns. The best months for surfing are typically from March to August, when ground swells dominate (51% to 59%) and mean swell sizes range from 1.5m to 1.7m. During this period, ground swell consistency peaks, particularly in May (59%) with June and July delivering the largest waves (1.7m). Wind conditions improve slightly in the autumn and winter months (May to July), with good wind days averaging 34%, still outnumbered by poor winds but less severe than summer. The summer months (December to February) see a higher proportion of wind swells (58% to 69%) and smaller waves (1.2m to 1.4m), paired with the worst wind conditions (72% to 73% unfavorable). September marks a transition, with ground swells dropping below 50% but still offering decent wave heights (1.5m). While surfable, the shoulder seasons (September to November and late summer) present more mixed conditions, with weaker ground swells and persistent onshore winds. For the most consistent and powerful waves, target the mid-autumn to mid-winter window when ground swells are strongest and winds are marginally less disruptive.

September at Mangamanu offers consistent surf with an average swell height of 1.5m and a solid 10.4s period, providing good energy for intermediate to advanced surfers. The swell direction is predominantly from the southern quadrants (S, SSE, SE), with the highest frequency of rideable waves (1-2.5m) coming from the S (22.6%), SE (10.4%), and ESE (7.4%). These directions tend to produce clean, well-shaped waves at this break. Wind conditions are ideal for surfing only 32% of the time, with light to moderate winds (0-20kph) from the ENE to ESE offering the cleanest conditions. However, stronger winds from the N, NW, and SW quadrants can create chop or onshore mess, particularly at higher speeds (20-50kph). Expect the best sessions when southern swells coincide with light easterly winds—typically smaller crowds and longer, organized rides. Bigger days (2m+) are less frequent but offer more powerful waves, especially when the period holds above 10s. Keep an eye on wind shifts, as northerlies can degrade conditions quickly. Overall, September delivers reliable surf, but patience and timing are key for optimal sessions.