Grupuk - surf spot statistics

Grupuk in Indonesia is a consistent surf spot with reliable ground swells year-round, rarely experiencing flat conditions. The swell is predominantly ground swell (92-100%), ensuring clean, organized waves, while wind swells are minimal (0-8%). The average swell size ranges from 1.4m to 2.0m, with the biggest waves occurring from June to September (1.8m-2.0m). However, wind conditions play a crucial role in determining surf quality. The best months for surfing in Grupuk are January, February, and December, when good wind conditions (offshore or light crosswinds) peak at 38%, 46%, and 24% respectively, offering cleaner faces despite some onshore days. From March to November, unfavorable winds dominate (64-99%), particularly from May to October, when bad wind conditions exceed 90%, often making the surf choppy or blown out. While August and September see the largest swells (2.0m and 1.9m), the wind is nearly always onshore (99%), reducing surf quality. For the best balance of swell size and wind conditions, target January and February—moderate swell (1.5m-1.6m) with the highest likelihood of clean conditions. December is also decent, though slightly less consistent with winds. Avoid May through October if you prefer glassy waves, as strong onshore winds prevail. Overall, Grupuk delivers waves year-round, but wind conditions make early and late dry season the prime windows for optimal surfing.