Morro dos Conventos - surf spot statistics

Best Surf Season (April - June)

As the South Atlantic high-pressure system begins to weaken and cold fronts from the Southern Ocean push farther north, Morro dos Conventos enters its prime window. During April, May, and June, the average swell height climbs to 1.5-1.6m with periods reaching 9-10 seconds, offering a solid mix of punchy, rippable waves. More importantly, the percentage of offshore winds from the W, WNW, NW, and NNW quadrants peaks at 29-34% — the highest of the year. This combination allows the predominantly east-southeast swell to be groomed by clean offshore breezes, transforming what would otherwise be onshore mush into lined-up, surging walls. Typical winter cold fronts deliver S to SW groundswell that bends around the coast and finds the optimal O or OSO bands, making dawn patrols especially rewarding.

Fair Surf Season (March & July - August)

March and the mid-winter months of July and August represent a transitional period where conditions are inconsistent but can still fire. March sees a decent 27% offshore wind frequency and swell averaging 1.4m with a 9.1s period, offering fun, groveling- to solid-sized waves when the stars align. July and August hold onto an average 1.5-1.6m swell height, but offshore wind percentages drop to 21-28%, and the dominant NE winds become stronger and more persistent. This leads to choppier conditions with shorter-period wind swell mixed in. However, when a strong cold front passes through and swings the winds to the west, the spot can pump with firing, long-period SSW to SW swell that wraps into the bay.

Low Surf Season (September - February)

From early spring through summer, the subtropical high strengthens and settles over the region, suppressing storm activity and steering persistent NE to ENE winds straight down the coast. September through December see offshore wind percentages plummet to just 14-16%, and even though the average swell height remains respectable at 1.4-1.7m, most of this is short-period, onshore wind swell blown out by relentless easterlies. The wave quality is often choppy, mushy, and difficult to ride. January and February are the heart of summer, with smaller average swell (1.3m), shorter periods (8.4-8.6s), and only 20-25% offshore wind windows. While there are occasional fun-size days when a rare south breeze lines up the E swell, the prevailing conditions favor flat spells and crowded, marginal surf.

December: Summer Setup, Marginal Surf

December kicks off the summer season with average swell 1.4m, period 8.5s, and offshore wind at 16%. The swell rose is similar to January: E (25.2%) and ESE (21.7%) leading, with easterly directions accounting for over 60% of all waves. Most waves are in the 1-1.5m range, fun but lacking power. Winds are predominantly NE (27.6%) and ENE (17.8%), with the west/northwest quadrant totaling only about 3.5%. The subtropical high is firmly entrenched, providing small, short-period swell and mostly onshore breezes. When the wind does swing to the west — often after a sea breeze or a rare front — the waves can become punchy and fun, but these windows are brief. December is best for beginners or longboard fun in the smaller, clean moments.