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.

February at Diego Garcia offers decent surf conditions with a mix of rideable swells and variable winds. The average swell height is 1.6m with a solid 12.8s period, indicating well-spaced, powerful waves ideal for intermediate to advanced surfers. The dominant swell directions come from the south (S, SSE, SSW), which are well-aligned with the spot, producing the best waves in the 1-2.5m range. Specifically, S and SSW swells provide the most consistent energy, with 18.5% of waves in the 1-1.5m range and 12.4% in the 1.5-2m range—solid overhead conditions. Wind conditions are a mixed bag; 36% of the time, winds are favorable for surfing (light to moderate offshore or cross-shore). However, strong W and WNW winds (20-40kph) occur frequently, which can create choppy or blown-out conditions, especially with 13% of WNW winds bringing 20-30kph gusts. For the best sessions, target days with lighter SSE-SSW winds or early mornings before stronger breezes pick up. Overall, February delivers consistent swell but requires careful wind timing.