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.

September at Diego Garcia delivers consistent surf with an average swell height of 2.3m and a solid 11.9s period, producing clean, powerful waves. The swell is predominantly from the SSE and SE directions, with the majority of waves falling in the 2-2.5m range (30.05% SSE, 12.32% SE), occasionally pushing larger. This suggests reliable, well-organized surf with good energy, though it can get heavy. Wind conditions are less favorable, with only 4% of the time offering ideal offshore or light cross-shore winds. The prevailing SE to ESE winds (often 20-40kph) frequently create chop or onshore slop, reducing quality. However, sheltered spots may still work on lighter wind days. Expect a mix of powerful, occasionally hollow waves when conditions align, but be prepared for wind-affected sessions. Advanced surfers will find the most opportunity here, especially when wind cooperates.