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.

May at Diego Garcia Island offers decent surf conditions, though not ideal for every session. The average swell height is 2.0m with a solid 13.5s period, indicating powerful, well-spaced waves. The swell direction is predominantly from the SSE, S, and SE, with the majority of waves falling in the 1.5-2.5m range (about 70% of the time), providing good size for experienced surfers. Smaller swells (1-1.5m) occur occasionally, while bigger sets over 2.5m are rare. The wind is the main limiting factor, with only 3% of days offering ideal offshore conditions. The most common wind directions are ESE and SE, often blowing at 10-30kph, which can create choppy or cross-shore conditions. Stronger winds (20-30kph) are frequent, making clean surf sessions scarce. When the wind aligns favorably, the long-period SSE/S swells can produce high-quality, powerful waves, but patience and timing are key. Overall, May delivers surfable waves regularly, but the wind will dictate whether they’re truly epic or just average.