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Surf forecast for Praia Preta

Map showing Praia Preta
Wwvs
3.1ft 4s.
43kJ
Swl 3
1.3ft 7s.
21kJ
Swl 2
1.9ft 6s.
35kJ
Swl 1
2.3ft 10s.
156kJ
Wnd
14mph
22mph
Tide
Mapbox© Mapbox© OpenStreetMapImprove this map
💨mph
🌊ft
⏱️s.
⚡️kJ
Timezone:
America/Sao_Paulo
Forecast updated:
07/10, 03:00 am
Wind: SN UNITY Atmos
(20261007 00z)
Waves: SN UNITY WAVE
(20261007 00z)

Weather

Wednesday 07/10

Water temperature
71°F
Daily average
Air temperatureBeta
Over water
69–71°F
On shore
64–71°F
Moon phase
Waning crescent
10% illuminated
Closest moon phase
New moon
Sat 10/10 12:51 pm
Tide range
-0.6ft - 3.6ft
Low 07:01 am · High 01:31 pm
Next spring tide
Sat 10/10
4.6ft range
Next neap tide
Sat 17/10
0.1ft range

Timeline

Wed 07/10
05:16 am - 07:00 am
Best
Fun with calm onshore. Low tide, falling.
Swell 12.5ft10.2 s(171 kJ)(S)
3 / 6 mph(WNW)
-0.3 → -0.7ft
07:00 am - 12:00 pm
Fun with light cross-onshore. Falling to low tide, then rising.
Swell 12.5ft10.1 s(177 kJ)(S)
8 / 12 mph(SW)
-0.7 → 3.0ft
01:00 pm - 03:00 pm
Fun but blown out (moderate cross-onshore). Rising to high tide, then falling.
Swell 12.2ft10.4 s(148 kJ)(S)
15 / 23 mph(SW)
3.6 → 3.0ft
03:00 pm - 05:00 pm
Fun with light sideshore. High to low tide, falling.
Swell 12.7ft9.9 s(190 kJ)(S)
8 / 14 mph(SW)
3.0 → 1.3ft
05:00 pm - 06:28 pm
Fun with light sideshore. Low tide, falling.
Swell 12.4ft8.7 s(121 kJ)(S)
5 / 9 mph(SSW)
1.3 → 0.7ft
Thu 08/10
12:00 pm - 06:28 pm
Best
Fun with light offshore. Rising to high tide, then falling.
Swell 12.8ft7.1 s(107 kJ)(SE)
6 / 10 mph(ESE)
2.6 → 0.7ft
Fri 09/10
05:14 am - 09:00 am
Best
Fun with calm cross-onshore. Falling to low tide, then rising.
Swell 13.2ft7.6 s(164 kJ)(SE)
1 / 6 mph(SW)
0.3 → -0.7ft
09:00 am - 02:00 pm
Fun with calm sideshore. Low to high tide, rising.
Swell 13.0ft7.8 s(151 kJ)(SE)
4 / 8 mph(S)
-0.7 → 3.6ft

Praia Preta Surf Forecast Guide

Praia Preta lines up best when the wind comes offshore from the east-southeast (ESE). That is the main condition to watch here, so keep an eye on the live forecast for swell and tide before you paddle out.

Surf spots near Praia Preta

Praia da Bertioga
Sao Paulo, Brazil
Unknown break
Wed 7
Thu 8
Fri 9
Sat 10
Sun 11
Praia Branca
Sao Paulo, Brazil
Beach break
Wed 7
Thu 8
Fri 9
Sat 10
Sun 11
Praia Preta
Sao Paulo, Brazil
Unknown break
Wed 7
Thu 8
Fri 9
Sat 10
Sun 11
Praia do Iporanga
Sao Paulo, Brazil
Unknown break
Wed 7
Thu 8
Fri 9
Sat 10
Sun 11
Sao Pedro
Sao Paulo, Brazil
Beach break
Wed 7
Thu 8
Fri 9
Sat 10
Sun 11

Frequently asked questions

What are good surfing conditions for Praia Preta?

Praia Preta is usually best with offshore wind from east-southeast (ESE).

Where is the surf spot Praia Preta?

Praia Preta is a surf spot in Guaruja, Sao Paulo, Brazil.

What surf spots are near Praia Preta?

Other nearby surf spots are Praia Branca, Praia do Iporanga, Praia da Bertioga, and Sao Pedro.

What wind direction is best for surfing at Praia Preta?

East-southeast (ESE) is offshore at Praia Preta.

What wind direction is offshore for surfing at Praia Preta?

East-southeast (ESE) is offshore at Praia Preta.

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Readme

Welcome! If you’re new to surf forecasting, check out this quick guide.

Forecast Table

The forecast table (the section on the page with all the numbers) is designed to pack as much information in the screen as possible. Although intimidating at first, it will help you make informed decisions about the waves faster, trust me :D. The table consists of roughly four sections, time and predictions, wind, waves, and tides:

🔮 Time and predictions section

Here we show the forecast thour and the overall surf quality prediction. This is determined based on the wave, wind and tide quality prediction. These individual predictions can be found on the forecast map.

💨 Wind section

The first row on the table (with the 💨 icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

🌊 Wave section

The waves section consists of three rows, one for wave height and direction, one for period and one for wave energy. Our algorithm chooses the "dominant wave" using spot-adjusted surf energy (depth + directional fit). This is usually the first swell partition, but during local storms it can switch to wind waves. If that happens, values are shown in gray and italic.

🎯 Model agreement

The small letter in the wind and wave cells shows how closely the weather models we blend agree for that hour.

  • H, the models line up closely.
  • M, the models differ somewhat, so conditions may still shift.
  • L, the models disagree, so check again closer to your session.
  • A dash means only one model covered this hour, so there was nothing to compare.

For wind we compare each model's wind vector, plus gusts where every model reports them. For waves we compare height, period and direction of the matched swell systems.

It is a measure of model agreement, not a probability that the forecast is right.

🌒 Tide section

The tide section consists of a row with the actual heights per hour (measured at the half hour) and a table that displays the flow of the tide and the extremes (lows and highs).

Forecast map

The forecast map consists of arrows. These arrows represent all wave partitions (swell partitions and wind wave partition) and the wind. This allows you to see things like: a secondary swell or wind waves messes up the surf, or the wind is just a tick offshore so very surfable. Click a metric label in the bottom left to bring that arrow to the front — handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. It’s the best single metric to gauge how big and powerful the waves will be.

Click any table cell to jump to that forecast hour. The map will update with forecast arrows, so you can see if wind and swell direction are lining up.

Use the table sidebar to switch units for height and speed.

Log your surf sessions to compare forecasts with real sessions and sharpen future predictions.

Models and Updates

Surfnerd blends multiple global and local wind and swell models using advanced interpolation and spatial techniques to create an "ensemble" forecast. Forecasts are refreshed hourly.

Surf Predictions

Our AI-driven algorithm scores surf quality, shown by green, orange, and gray dots. Each forecast hour is rated for wind, swell, and tide quality, then combined into an overall score. Here’s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm — the more you log, the smarter your forecasts get.

With Surfnerd, no more "you should have been here yesterday"

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