Motunau Beach Island - surf spot statistics

Motunau Beach Island in New Zealand offers a mix of ground and wind swells throughout the year, with no months entirely devoid of swell. The best conditions for surfing generally occur between April and August, when ground swell dominance increases, averaging 54-58% of the swell mix, resulting in cleaner, more organized waves. During these months, mean swell sizes peak at 1.7-1.9m, providing solid surfable conditions. Wind conditions improve slightly in this period, with good wind days ranging from 28-32%, though onshore winds still dominate. Winter months (June-August) offer the most consistent swell but come with higher wind variability. The summer months (December-February) see a higher proportion of wind swells (61-72%), which can lead to choppier conditions, compounded by less favorable wind patterns (only 20-21% good wind days). For surfers seeking quality waves, the autumn and winter transition (April-July) stands out as the prime window, balancing decent swell size, cleaner ground swells, and marginally better wind odds compared to the rest of the year. However, even in the best months, surfers should expect challenging wind conditions frequently.

In May, Motunau Beach Island experiences solid surf conditions with an average swell height of 1.8m and a favorable period of 10.8s, indicating well-formed and powerful waves. The dominant swell directions are from the southern quadrants (S, SSE, SSW), with the highest frequency of rideable waves (1m+) coming from S and SSW—they deliver consistent, clean energy, especially in the 1.5-2.5m range, making up a significant portion of the swell distribution. ENE and E swells also contribute but are less consistent. Wind conditions are ideal for surfing only 31% of the time, with lighter winds (under 20kph) most common from ENE, E, and ESE—these offshore or cross-offshore winds groom the waves best. However, strong SW and SSW winds (20-50kph) are frequent, creating choppy or blown-out conditions. Overall, May offers decent surf, particularly when southern swells align with lighter ENE/E winds, but patience is needed to score clean sessions amidst the variable wind patterns.