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.

July at Diego Garcia offers consistent surf with an average swell height of 2.6m and a long-period groundswell averaging 13.1s, ensuring powerful, well-spaced waves. The best swell directions are SSE (33.52% occurrence at 1.5m+) and SE (6.25% at 1.5m+), delivering clean, rideable waves with good energy. However, wind conditions are challenging—only 1% of winds are ideal for surfing, as the dominant SE/ESE winds (60-80% of the time) blow at 20-40kph, creating choppy onshore conditions. The strongest swells (2m+) peak around SSE (32.52%), but expect frequent wind-affected sessions. Advanced surfers will find occasional clean pockets, particularly during rare lighter wind windows, but most days require tolerance for bumpy faces. Bring a step-up board for handling the solid swell energy.