Maresias
Brazil · South America
Right now
Rain showersWind and swell direction
Swell: 1.0m S
Wind: 5 km/h SSW (cross-onshore)
Beach faces: SE
Very light wind. Expect glassy, clean conditions.
Swell is coming in at an oblique angle, some refraction expected.
Today hour by hour
Updated 08:37Expected crowds
Prediction model v16amDawn patrol territory
7amMidweek quiet
Next 7 days
Forecast via Open-MeteoWhat to pack
- Boardshorts weather. 27°C water.
- Standard shortboard conditions.
- Rain jacket for between sessions.
Today's briefing
0.8m swell at 8s. Moderate winds. Water temperature 27°C.
AI-generated summary for Maresias. Always check local reports before heading out.
Forecast accuracy at Maresias
Not enough data yet. Log a session to help build the accuracy score.
Best time to go
No great windows in the next 2 days
Best available option is Tomorrow around 1pm (score: 30). Conditions are below the Good threshold but may still be surfable.
Crowd report
No recent check-ins. Be the first to report.
Session journal
Record your session, conditions and gear.
Sign up to save favourite spots and get surf alerts
Create free accountTide
Approximate modelSwell forecast
7-day forecastDaily score breakdown
This week is looking above average for late April.
Comparing the 7-day forecast to the last 5 years of marine data for the same week at Maresias.
What's driving it
Recent form
Last 3 days of logged conditions.
About Maresias
Maresias is an immensely powerful, high-performance beach break situated on the northern coast of S-o Paulo, Brazil. The bathymetry is entirely defined by exceptionally steep, shifting silica sandbanks located very close to the shoreline. Facing south-east, the beach captures unattenuated groundswells tracking up the South Atlantic. When a solid swell impacts this sudden vertical gradient, the ocean heaves violently, producing incredibly thick, top-to-bottom plunging left and right-hand barrels. A north-westerly wind blowing off the adjacent Serra do Mar mountains is crucial to hold the heavy lips open. Due to the extreme hydraulic force, the immediate proximity of the break to the shallow sand, and the necessity for rapid, near-vertical take-offs straight into a tube section, Maresias is exclusively the domain of advanced and professional surfers. It is a highly consequential, high-speed tube riding arena known for severe hold-downs and broken equipment, demanding absolute commitment, elite physical reflexes, and technical proficiency.
Working in Maresias this season?
Create a free profile and let employers in Maresias find you.
Create Profile →Frequently asked questions
How often is this page updated?
Current conditions refresh every 6 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.
What is the luck factor?
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 late April.
How is 'best session' picked?
We score each day of the 7-day forecast using the same algorithm as the leaderboard, and highlight the highest scorer.
Where does the data come from?
Open-Meteo's Marine API (swell height, period, water temperature) and Weather API (wind and conditions).
Does the score capture local knowledge?
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.
When is the best time to surf Maresias?
Check our timing score heatmap above for a week-by-week breakdown combining surf conditions with crowd pressure.