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Maresias is one of Brazil's most powerful beach breaks, producing thick, heavy barrels on the northern coast of Sao Paulo state. The combination of steep sandbanks very close to shore and the proximity of the Serra do Mar mountains (which funnel offshore winds directly onto the break) creates a wave of extraordinary intensity for a beach break. The lip throws top-to-bottom with reef-like power. This is where Brazilian competitive surfing cuts its teeth.
South to south-east Atlantic groundswells from March through September deliver the heaviest conditions. The wave needs at least 4ft of swell to produce barrels, with 6-8ft days creating world-class tubes. North-westerly offshore winds blow off the Serra do Mar mountains, strongest from midnight through the morning. This mountain-funnelled offshore is Maresias' secret weapon.
The main peak sits where the deep channel meets the steep inner bar. The wave produces A-frame peaks with both left and right barrels. The take-off is steep and fast, often near-vertical. Position yourself just outside where the sets first hit the bar. The shifting nature of the sand means the peak moves; watch a few sets to identify the active bank.
The wave breaks with extreme hydraulic force in very shallow water. The take-offs are steep and the lip is thick. Hold-downs drive you into the sand with significant force. Strong rip currents run through the channels between banks. The close-proximity shorebreak can be brutal. Board breakage is common on bigger days. The crowd is intense and the local surfers are among Brazil's best.
Parking along the beachfront road. The beach is immediately accessible with multiple entry points. Full facilities including restaurants, shops, and accommodation line the main street. Maresias is approximately 2.5 hours' drive from Sao Paulo city on the coast road.
Maresias is Brazil's competitive surfing hub and the line-up is aggressive with extremely skilled locals. Expect 30-50 surfers on good days. The standard is professional quality. The atmosphere is intense and competitive. Dawn patrol and weekdays offer slightly better ratios.
The offshore wind from the mountains is the key variable. When the north-westerly is blowing clean and a solid swell is running, Maresias transforms from a regular beach break into a world-class barrel. Check wind direction at dawn; if it is blowing off the mountains, get in the water immediately. The window can be brief before the sea breeze takes over. A strong shortboard with extra rocker handles the steep drops. The water is warm enough for a spring wetsuit most of the year (20-24C).
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Based on historical weekly averages
Combining historical conditions with school holiday crowd pressure to find the sweet spot.
How busy each week is based on school holiday overlap from feeder markets.
The timing score combines two signals: historical conditions quality (how good the skiing or surfing typically is in a given week, based on 5 years of weather data) and crowd pressure (how many of this destination's feeder markets have school holidays that week).
Crowd pressure is weighted by each feeder country's share of visitors. If 40% of a resort's visitors come from France and France is on holiday, that contributes 0.40 to the crowd pressure score. Crowds can reduce the timing score by up to 35%, ensuring conditions still matter most.
Scores: 5 = great conditions with low crowds (the sweet spot). 4 = great conditions with moderate crowds, or good conditions with low crowds. 3 = average. 2 = below average conditions or very crowded. 1 = poor conditions or peak holiday chaos.
Last 29 days of logged conditions.
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Create Profile →Current conditions refresh every 3 hours when the cron runs. Hourly data updates every 30 minutes. The 7-day forecast, luck factor, and packing notes are all pre-computed at the same time.
We compare the 7-day forecast to the last 5 years of marine data for the same week at Maresias. The delta tells you whether conditions are shaping up better, worse, or about the same as a typical mid-June.
We score each day of the 7-day forecast using the same algorithm as the leaderboard, and highlight the highest scorer.
Open-Meteo's Marine API (swell height, period, water temperature) and Weather API (wind and conditions).
Honestly, no. Every break has tide windows, swell directions and reef contours that a global model cannot see. Treat the score as a starting point, then check a local cam.
The best week for surf at Maresias is the week of 16 November (score 3/5) with low crowds.
Slim pickings. Only worth it if you are gagging for a wave. Light cross-shore texture but very manageable. Best conditions early morning before the sea breeze arrives. Not enough swell to get this spot firing properly.
Heads up: thunderstorms forecast, and jellyfish: high.
Indicators derived from forecast data, not official warnings. Always check local lifeguard or official advice.
Good water clarity: ~8m visibility
Daily scores over the last 12 months at Maresias