Diego Garcia Island - surf spot statistics

Diego Garcia Island offers surfable conditions year-round, with consistent swells primarily driven by ground swells, which dominate over wind swells in most months. The best time for surfing is typically from February to April, when a high percentage of ground swells (78–83%) combines with relatively manageable wind conditions (good winds 28–42% of the time). Swell size during this period averages 1.5–1.8m, providing solid but not overwhelming waves. February stands out as the most balanced month, with 82% ground swells, 36% good winds, and 1.6m waves. March follows closely, maintaining similar swell quality with slightly improved wind conditions (42% good winds). From May to October, the swell size increases (2.0–2.6m) as the Indian Ocean generates more powerful ground swells (peaking at 88% in May). However, this period is hindered by extremely poor wind conditions, with bad winds prevailing 91–100% of the time, making it challenging for surfers despite the larger waves. August is particularly harsh, with 100% bad winds and 2.6m swells. The late-year months (November–January) see a return to smaller swells (1.6m) and slightly improved wind conditions, though bad winds still dominate (74–87%). December and January offer decent ground swell percentages (73% and 65%, respectively), but January has the lowest good wind probability (22%). For surfers prioritizing clean conditions, the February–April window is the most reliable, while those seeking bigger (but wind-affected) swells may brave the May–October stretch.

August at Diego Garcia offers solid surf conditions with a mean swell height of 2.6m and a long-period energy averaging 12.3s, indicating powerful and well-organized waves. The swell predominantly arrives from the south-southeast (SSE) and southeast (SE), with the majority of waves in the 2-2.5m range (24.23% from SSE) and some larger sets exceeding 2.5m (2.31% from SSE). These directions suggest favorable alignment for the spot, though wind conditions are far from ideal—0% of the time is clean for surfing. Winds are mostly onshore from the southeast (SE) at 20-40kph (29.13% at 30-40kph), creating choppy or cross-shore conditions. Advanced surfers will find punchy, powerful waves but should expect gusty winds impacting quality. The absence of favorable offshore winds means sessions are best timed for early mornings or rare lulls. Overall, expect strong, consistent surf but with challenging wind interference.