Playa Ostional - surf spot statistics

Best Surf Season (November - April)

The dry season at Playa Ostional brings a potent mix of consistent, long-period SSW to WSW swell and steady offshore trade winds from the northeast quadrant. From November through April, the North Pacific storm track fires up, sending groundswell pulses across the basin. The average swell height holds in the 1.3-1.5m range with periods often exceeding 12 seconds, delivering punchy, rippable waves. Offshore winds dominate the wind rose, with NE and ENE flows grooming the southwest-facing beach into clean lines. November and December stand out with the highest percentage of ideal wind (61% and 58% respectively), while January through April maintain a solid 40-46% ideal window, despite occasional stronger trade wind pulses. This is prime time for consistent, user-friendly surf.

Fair Surf Season (May - August & October)

As the Intertropical Convergence Zone creeps north, the rainy season sets in and the wind patterns become more variable. During May through August, the swell remains excellent—dominated almost entirely by SSW and SW directions with heights averaging 1.4-1.5m and periods of 13-14 seconds. However, the wind is less reliable. Light onshores and variable breezes become more common, though July and August still see ideal wind percentages of 62% and 51% respectively. October also falls in this category, with a mix of strong SW swell (over 95% from the SW quadrant) but a higher proportion of onshore S and WSW winds. The quality is still there, but you have to pick your days around the wind shifts.

Low Surf Season (September)

September marks the low point of the year for wind conditions. The ideal wind percentage drops to just 37%, the lowest of any month. While the swell remains powerful and consistent (over 95% from SSW/SW at 1.5m average height, 13.1s period), the wind is frequently from the S, SW, and WSW—directly onshore for Playa Ostional. This combination creates swamped, choppy conditions that ruin wave shape. The few good days come when a brief offshore flow from the east or a lull in the onshore winds coincides with a swell pulse, but overall, September is a month to approach with caution or look for alternate spots.

May: Maximum South Swell

May continues the trend of almost exclusive swell from the southern quadrant—81.4% SSW and 13.8% SW, together over 95% of the total. The average period peaks slightly to 14.2 seconds, and the average wave height rises to 1.4m. Notably, nearly 25% of the SSW swell measures 1.5-2m, and 1.8% exceeds 2m—some of the biggest surf of the year. The wind patterns become more mixed: the NE trades weaken (only 9.3% of total wind, mostly light), and winds from the S, SSE, and SE become more common. The ideal wind percentage drops to 43% as light variable breezes and occasional onshores (S 10.2%, SSW 9.1%) take hold. Surfing May is about chasing the clean windows between squalls. The swell is powerful and consistent, but the wind can be fickle. When it works, the waves are pumping.