Onekaka (Nelson-Tasman Bay)

Onekaka is an exposed beach break on Golden Bay’s Nelson–Tasman Bay side, best thought of as a spot that mainly offers small surf and only occasionally lines up into something more surfable. Surf tends to be overwhelmingly in the small category and the spot is described as very infrequent overall, so planning depends on the specific swell/wind match. For surf, the commonly cited “go” setup is an East-northeast (or broader North/Northeast) swell wrapping into the bay while West/Southwest winds are offshore. When that alignment happens, the surf is still typically described as soft and mushy with short rides over shifting sandbanks. Mid-tide conditions are noted as optimal when it works, but the spot’s character remains highly tide-dependent. Water conditions across the year are described as clean, with water temperatures ranging from around 12–13°C in winter up to about 18–20°C in summer (about 20–23°C air in peak summer months). Because the beach is very tidal and sandbanks shift, low tide can quickly make depth marginal—so depth checks are essential before committing. Safety-wise, the old Onekaka Wharf remains as a prominent hazard: submerged structures/piles and rusty iron can be dangerous both in the water and around the beach approach. There are no lifeguards reported at the spot, but regional marine rescue coverage exists (Coastguard operates from Tarakohe) and emergency services can be reached via 111. Overall, it’s a quiet, low-profile location—suited to those who can handle variable conditions and who are comfortable targeting the rare windows when swell and wind align.