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.

September at **Motunau Beach Island** offers fairly consistent surf, with an average swell height of **1.7m** and a strong **10.3s period**, indicating well-spaced, powerful waves. The dominant swell directions are from the **SSW, S, and SE**, providing the best-sized waves (1-2.5m+) and cleanest conditions. Smaller contributions from ENE and NE can occasionally mix in, but the southern quadrants are the primary producers of rideable surf. Wind conditions are a mixed bag—while **28% are ideal** (likely light offshore or cross-offshore), onshore winds from the **N to NW** are common, particularly at higher speeds (20-50kph), which can degrade wave quality. The strongest winds tend to come from the **SSW and SW**, aligning with the best swell directions but potentially creating choppy or blown-out conditions. For surfers, September is decent but requires selective timing: target days with SSW/S/SE swell and lighter winds from the eastern quadrants for the cleanest, most ridable waves. Bigger days (2m+) are possible, especially from the SSW, but expect more challenging wind interference.