Surf Forecasts:
Sao Lourenco surf forecast from 4 Aug 2026:
- Best quality surf: Saturday 8 Aug, 9PM (local time) - 4.5ft (1.3m), 13s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 10 Aug, 3AM (local time) - 5ft (1.6m), 12s period, S swell with 738 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 9AM (local time) - 1ft (0.3m), 13s period with S swell.
Best Forecast Surf Conditions for Sao Lourenco this week:
The surf forecast for Sao Lourenco over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 04) at 9AM. The primary swell is predicted to be 0.3m and 13s period with a secondary swell of 0.5m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Sao Lourenco in the next 16 days are 1.6m 12s and forecast to arrive on Monday (Aug 10) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Aug 09) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Tue 4th Aug) | 1ft (0.3m) 13s |
| Best Surf | 9PM (Sat 8th Aug) | 4.5ft (1.3m) 13s |
| Most Powerful | 3AM (Mon 10th Aug) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Sao Lourenco over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s break down the next couple of weeks at Sao Lourenco in feet and miles per hour.
This river mouth spot is fairly consistent and open to the south. It loves a southeast swell, so when the wind plays nice, it can really pump. The water is a touch warmer than average for this time of year, coming in at 70°.
First chance to get wet is Tuesday morning, 4th August. It’s tiny – just 1.0ft of south swell – but the wind is light and cross-off, so it’s clean. That afternoon the wind goes glassy, and the swell nudges up to 2ft with a 12-second period, but the energy is weak.
Wednesday the 5th is the first real standout. The morning is clean with offshore wind, 3ft of south swell at 11 seconds, and moderate energy. Not huge, but the conditions are spot on.
We lose a bit of quality Thursday and Friday, with small, weak swells and some cross-off or glassy windows. Saturday morning the 8th is glassy calm with a 2ft, 15-second south swell – that’s long-period groundswell, and the energy is moderate. For a river mouth, that long period can mean clean lines, but it might also break a little straight.
Sunday the 9th morning is glassy again, with 4ft of south swell at 13 seconds and solid energy. That’s a good session if the tide is right.
Things get messier Monday and Tuesday the 10th and 11th, with swell ranging 4ft to 5ft, but the wind is cross-shore and the periods drop, so it’s less clean. Wednesday the 12th sees 6ft of southerly swell with onshore wind – that’s a no-go for a clean paddle.
Then we get a nice run from Thursday the 13th through the weekend. Thursday morning is glassy with 3ft of south swell – clean and fun. But the real highlight is Friday morning, 14th August. We’ve got glassy conditions, 4ft of south swell with a 14-second period, and solid energy. That’s the best session of the whole forecast – the waves will have shape and power.
Saturday the 15th afternoon is also a standout: 5ft of south swell, cross-off wind, and strong energy. That’s good, clean, and punchy for the more experienced.
The following week drops off. Sunday the 16th still has some glassy 3ft waves, but by Monday the 17th it’s fading. The real action returns on Wednesday the 19th, but that’s 15 days out. We’re looking at 6ft to 7ft of south swell with onshore wind – that’s big, messy, and only for experts. The energy is strong, but the wind is onshore, so it’s a battle.
Overall, the best bet is the morning of Friday the 14th – glassy, 4ft, 14-second south swell, clean and powerful. Saturday the 15th afternoon is also a cracker. For the rest, pick the glassy windows and go small.
Rusty out.
Short Range ForecastMostly dry. Warm (max 33°C on Thu morning, min 21°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri night. Warm (max 32°C on Fri morning, min 19°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SE 11 | S 12 | S 12 | S 11 | S 11 | S 10 | S 10 | ESE 8 | E 8 | S 12 | E 8 | E 8 | S 15 | S 12 | S 13 | S 13 | S 12 | S 12 | S 8 | SSE 12 | S 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 31 | 74 | 141 | 160 | 116 | 74 | 50 | 60 | 55 | 28 | 42 | 29 | 107 | 420 | 492 | 448 | 350 | 295 | 223 | 569 | 480 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-off | off | glassy | cross-off | cross-off | glassy | cross-off | cross-off | glassy | cross-off | glassy | cross-on | cross-off | glassy | cross-on | cross-on | cross | cross | cross |
High Tide | 6:08PM0.96m | 6:29AM1.01m | 6:51PM0.85m | 7:39AM0.90m | 7:50PM0.74m | 12:29PM0.87m | 9:48PM0.67m | 1:19PM1.01m | 00:35AM0.75m | 1:53PM1.13m | 1:04AM0.86m | 2:22PM1.19m | 1:31AM0.97m | ||||||||
Low Tide | 12:44PM0.34m | 00:48AM0.44m | 2:08PM0.47m | 2:27AM0.48m | 4:01PM0.54m | 4:13AM0.44m | 5:44PM0.52m | 5:36AM0.34m | 6:56PM0.46m | 6:40AM0.20m | 7:44PM0.41m | 7:30AM0.07m | 8:21PM0.38m | ||||||||
 |  |  |  | |  | | | | | |  | | | | | |  |  | |  | |
 | 6:37 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | 5:42 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | 5:44 | — | — | 5:44 | — | — | 5:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 | 1 | — | — |
Temp °C | 28 | 26 | 22 | 29 | 27 | 23 | 33 | 33 | 28 | 32 | 29 | 21 | 29 | 30 | 29 | 25 | 21 | 20 | 20 | 19 | 19 |
Feels °C | 27 | 26 | 22 | 28 | 27 | 22 | 31 | 33 | 26 | 29 | 30 | 22 | 30 | 32 | 29 | 26 | 24 | 23 | 22 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | E 7 | ESE 7 | S 12 | S 11 | S 11 | ESE 8 | ESE 8 | ESE 8 | E 8 | E 7 | E 8 | E 8 | S 11 | S 12 | S 13 | S 13 | S 12 | S 7 | S 8 | SSE 12 | S 12 |
| kJ | 22 | 35 | 141 | 160 | 116 | 47 | 44 | 60 | 55 | 28 | 42 | 29 | 55 | 420 | 492 | 448 | 350 | 123 | 223 | 569 | 480 |
Swell 2 Height (m) Direction Period (s) | S 13 | S 12 | ESE 7 | ESE 7 | ESE 7 | S 10 | S 10 | S 10 | SSE 9 | S 12 | SW 3 | S 4 | S 15 | S 15 | ESE 5 | E 5 | E 8 | S 12 | S 12 | ESE 8 | ESE 6 |
| kJ | 31 | 74 | 37 | 36 | 42 | 74 | 50 | 46 | 28 | 25 | 2 | 9 | 107 | 168 | 27 | 14 | 33 | 295 | 184 | 12 | 22 |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | SE 10 | SE 10 | SSW 7 | — | S 16 | SSE 15 | SSE 13 | SSE 9 | S 11 | S 10 | ESE 8 | — | E 8 | E 15 | — | ESE 8 | ESE 8 | E 13 | — |
| kJ | 30 | 17 | 15 | 4 | 10 | — | 5 | 21 | 17 | 8 | 21 | 17 | 19 | — | 10 | 4 | — | 22 | 14 | 3 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 2 | — | N 2 | NNW 4 | — | — | E 8 | E 4 | E 5 | — | SW 4 | — | — | SE 6 | — |
| kJ | — | — | — | — | — | — | 1 | — | 1 | 15 | — | — | 76 | 26 | 47 | — | 17 | — | — | 32 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 0 | 0 | 0 | 36 | 0 | 0 | 110 | 14 | 14 | 14 | 14 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Sao Lourenco Surf forecast
The above surf forecast table for Sao Lourenco provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sao Lourenco can be found by selecting the local surf guide option on the grey menu. Our Sao Lourenco surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Sao Lourenco) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Sao Lourenco may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Sao Lourenco is 13 km (8 miles) from Bertioga. If you plan a holiday in São Paulo, look for hotels and other accommodation in Bertioga. Bertioga has rooms for a wide range of budgets as well as car hire and transport links.
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