Assinie - surf spot statistics

Best Surf Season (November - January)

The North Atlantic and Southern Ocean swell machine fires, but it's the shift in the trade wind belt that truly unlocks Assinie's potential. During these months, the ITCZ migrates south, allowing the dry, offshore Harmattan winds (from N, NNE, NE, NNW) to penetrate the coastline with increasing frequency. While average swell heights hover around the 0.9–1.0m mark, the wave period remains solidly in the 10.5–10.8s range—powerful, long-period groundswell that wraps in from the South and SSW. The result? Clean, glassy mornings with fun-sized, rippable waves. December leads the pack with a 9% window of ideal offshore winds, and January peaks at 10%. It's not about size; it's about quality. When the stars align, you get pristine, offshore lines peeling down the beach—a true gift for the patient surfer.

Fair Surf Season (February - May & October)

As the ITCZ begins its northward migration in February, the reliable Harmattan starts to falter. Onshore breezes from the SW and SSW become more dominant, reducing the percentage of clean surf opportunities to 3–6%. However, the swell doesn't take a holiday. February and March see average wave heights holding at 0.9–1.0m, while April and May ramp up to a solid 1.1–1.2m with periods stretching to 11.5–11.7s. This is the heart of the Southern Ocean storm track, firing long-period, groundswell trains that march straight into the bay. The challenge is the wind: mostly onshore, but occasional prefrontal northerlies or early morning calms can offer short windows of clean surf. May is the standout, with a 6% ideal wind statistic and a high percentage of 1–1.5m waves. October mirrors this transitional feel, with the first hints of the Harmattan returning and average swell sizes still a respectable 1.1m.

Low Surf Season (June - September)

The deep tropical winter sets in, and Assinie feels the full brunt of the Southwest Monsoon. The ITCZ is parked well north, driving relentless onshore winds from the SW and SSW that blow 40–50% of the time. Ideal offshore wind conditions drop to a paltry 0–1%, making clean surf a rare commodity. That's a shame, because this is actually the largest swell season—average heights hit 1.3m, wave periods peak at 11.6–11.7s, and there are occasional pulses exceeding 1.5m. The waves have power and push, but they arrive wrapped in choppy, wind-affected faces. Every now and then, a weak cold front or a brief lull in the trades can coax out a few hours of semi-clean conditions, but for the most part, it's a battle against the elements. Save your holiday leave for the winter months unless you're a glutton for punishment—or a kiter.

April: Southern Ocean Fury, Monsoon Onslaught

The Southern Ocean is in full winter mode, pumping solid groundswell into the Gulf of Guinea. Average swell height climbs to 1.1m with a period of 11.5s, and for the first time, the 1–1.5m class becomes dominant: 54.4% of S swell and 17.3% of SSW swell fall into this fun-sized category. A tiny fraction even reaches 1.5–2m (0.8% for both). This is proper surfable swell. Unfortunately, the SW monsoon is also strengthening—ideal offshore wind remains a paltry 4%. Onshore winds from SW (35.6%) and SSW (26.5%) blow consistently, often at 10–20kph. The rare clean windows are short and precious. April is a month of high potential and low consistency. If you can get on a northerly day, you'll be rewarded with some of the best waves of the year.