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British Indian Ocean Territory- Diego Garcia Island
Conditions at Diego Garcia Island in September
September: Late Trades, Lingering Power
September is still locked in the southwest-monsoon regime, but there are subtle signs of change. The average swell height eases slightly to around 8ft (2.4m), the average period is 11.2s, and ideal wind flow remains minimal at 3 percent. ESE (32.7%) and SE (42.5%) still rule the wind rose, though the strongest 30-40kph winds are a little less dominant than in August. Swell is concentrated in SSE (34.4%) and SE (24.2%), with the S (7.0%) sector fading. The surf quality problem is the same: wrong direction, plus persistent trade winds. That said, the waning wind intensity and occasional interruptions in the flow can create a few more workable windows than July or August. Water temperature starts to recover at 27.3°C, air temps nudge up to 26.6°C, and rainfall increases to 5.45mm/day as the monsoon begins its slow transition. This is still a low-season month, but the light at the end of the tunnel is starting to appear.
Average Spot conditions at Diego Garcia Island in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Diego Garcia Island during September. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Diego Garcia Island for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Diego Garcia Island for September. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Diego Garcia Island.