Isla Grande • Statistics for September

September: Cleanest Waters, Smallest Waves

September brings the highest percentage of ideal wind all year at 42%, as the Caribbean low-pressure trough and tropical waves sweep the region. Afternoon and early morning windows with SW to W winds are frequent, leaving the ocean often glassy. However, the average swell height bottoms out at just 0.8m (2.5ft) with a shorter 7.3s period. The good news is that 88.7% of that swell still comes from the NE, so the lines that do show have direction. This is the month for longboarders and grovelers - a small but playful 2-3ft (0.6-0.9m) wave can be found with clean shape more often than any other time of year. Water temperature peaks at 29.3°C and precipitation is high (8.32 mm/day). If you're chasing perfection over power, September is your month.