Ral Island - surf spot statistics

Best Surf Season (October - March)

The North Pacific swings into action as the monsoon trough retreats, sending long-period groundswell marching toward Ral Island from the NNE and NW quadrants. Average wave heights hover around 1.2-1.3m with periods frequently reaching 10-10.5s, offering powerful, rippable waves. However, the tropical wet season brings a dominance of NW-to-N winds that are onshore and often ruin the surface. The window for ideal offshore S/SSW winds remains narrow (17-30% of the time), so patience and a sharp eye on the forecast are key. When a high-pressure system settles to the south, the winds align, and the island lights up with clean, hollow walls.

Fair Surf Season (April - May & September)

As the monsoon transitions to the southeast trade wind regime, the frequency of clean offshore breezes climbs dramatically (39-66% ideal wind). Swell heights drop to the 0.9-1.0m range, and periods shorten slightly to 8.8-9.6s. While the waves become more playful and fun-sized, the lack of real grunt means groveling and small-wave boards come into play. The trade winds from the E/ESE blow offshore for the south-facing points, but at Ral Island they are cross-onshore; however, the southern quadrant winds (S, SSW) become more common during these shoulder months, delivering that elusive glassy texture. This is the time for uncrowded, fun sessions without the hassle of the wet-season gales.

Low Surf Season (June - August)

The depths of the southeast trade wind season lock in a relentless pattern: strong, consistent E to ESE winds that blow onshore across the north-facing beach, while swell production shifts to short-period, small easterly windswell. Average wave heights bottom out at just 0.8m with periods a feeble 7.6-8.0s. The dominant swell from ENE and E is far from the optimal N/NNE directions, so the waves lack power and shape. On the plus side, offshore wind percentages reach their annual peak (63-64%), but the swell is simply too weak to turn that into quality surf. Only the occasional long-range pulse from a distant North Pacific storm can break the monotony, but those are rare. This is the low season – best saved for exploring reefs or working on your tan.

September: The Turn of the Tide

September marks the beginning of the upward trend. Average swell height remains at 0.8m, but the period climbs to 8.9s, indicating more organized energy. Swell directions broaden: NE (24.7%) and ENE (34.6%) still lead, but NNE returns to 13.5% and N to 3.9%. The wind picture improves further – ideal wind frequency hits 66%, the highest of the year. However, the predominant wind directions are still ESE (26.0%) and SE (18.5%), which are onshore. The key is that S and SSW winds become more common (5.4% and 3.6% combined), and the mornings often see lighter variable breezes. You can start to find clean, chest-high waves on the better days. September bridges the gap from the low season to the building swell of spring.