Caldera - surf spot statistics

Best Surf Season (October - March)

The North Pacific winter brings a subtle uptick in southern hemi groundswell pulses to this exposed West-South-West-facing beach. While wave heights remain stubbornly small, averaging just 0.3m, the extended swell periods (10-14s) hint at a more organized, albeit diminutive, energy. Despite the trade winds blowing from the northeast nearly year-round, the months from October through March see a slightly higher chance of lighter wind days and the faint possibility of a waist-high, glassy wave. It’s a season of micro-sessions where the long-period groundswell can sometimes offer shoulder-high rides on a big day, but expect to be on a groveler more often than not.

Fair Surf Season (April - September)

The core of the wet season sees a further contraction of the swell window. Dominant SSW swell angles (over 70%) continue to feed the coast, but the average height barely registers above 0.3m. The Intertropical Convergence Zone sits overhead, pumping moisture and often strengthening the onshore trade winds from the NNE and NE. This combination results in mostly choppy, messy conditions with very little rideable wave face. Occasional breaks in the wind may coincide with a long-period pulse, but these are rare. The surf is consistently small and wind-affected, making this a genuine low season for quality waves.

Low Surf Season (Year-Round Reality)

Objectively, Caldera is a flat-wave environment for the vast majority of the year. The average swell height hovers around 0.2-0.3m every month, with over 99% of all waves falling in the 0-0.5m range. The wind is never ideal (0% offshore from the optimal NNO-NO-ONO-O directions), and the prevailing northeast trade winds blow directly onshore across the West-South-West-facing beach. While the swell period is often impressive (10-15s), indicating distant storm origin, the lack of any significant height means surfable waves are exceedingly rare. This coast is best suited for days with a rare, powerful southern hemi groundswell that pushes into the 1-1.5m range – but those events are almost non-existent in the climatological record. Patience is a virtue here.

August: Still Waiting for a Pulse

August continues the trend: average swell height 0.3m, period 14.1s. Swell from the SSW accounts for 74%, with SW making up 10%. All waves under 0.5m. Wind patterns are similar to July – mainly S (17%), SSE (13%), and SSW (12%) – all onshore or cross-shore. No ideal wind. The data shows that even in the peak of the southern hemi storm season, the fetch is either too weak or too far away to deliver size to this particular stretch of Costa Rica. The result is consistent flatness with occasional knee-high rollers that are bumpy from the trade winds.