
Surf Forecasts:
Maresias surf forecast from 5 Sep 2026:
- Best quality surf: Monday 7 Sep, 3AM (local time) - 8ft (2.4m), 10s period, S swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 6AM (local time) - 8ft (2.4m), 10s period, S swell with 1,177 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 9AM (local time) - 2ft (0.6m), 10s period with SSE swell.
Best Forecast Surf Conditions for Maresias this week:
The surf forecast for Maresias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 05) at 9AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.8m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Maresias in the next 16 days are 2.4m 10s and forecast to arrive on Monday (Sep 07) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Wednesday (Sep 09) at 12AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Sat 5th Sep) | 2ft (0.6m) 10s |
| Best Surf | 3AM (Mon 7th Sep) | 8ft (2.4m) 10s |
| Most Powerful | 6AM (Mon 7th Sep) | 8ft (2.4m) 10s |
Table - best surf conditions forecast for Maresias over the next 16 days.
The Lowdown
G’day, I’m Rusty, and I’ve had a good look at what’s coming up for Maresias. We’ve got a bit of a slow start, but don’t write it off – there’s some serious potential further down the line. The water is sitting at 71°, which is a touch warmer than normal for this time of year, so you can leave the steamer at home for now.
The first few days are pretty ordinary. Saturday morning, the 5th of September, you’ll find some small 2 ft swell from the SSE with a period of 10 seconds – it’s surfable but very ordinary, with weak energy (114). The wind is glassy though, so if you’re desperate for a paddle, it’s not completely hopeless. Saturday afternoon drops even further to 1 ft. Sunday the 6th is a write-off onshore slop, so stay on land.
Now, Monday the 7th is where things start to get interesting. The swell jumps to a solid 7 ft from the S, period 10 seconds, and the wind goes glassy on the morning session. The combined energy is moderate to strong (987), and the report says “very good surf conditions.” This is a standout for the first week. Maresias is exposed to the south, so this S swell will wrap in nicely. The morning is glassy, but the afternoon turns cross-off with a light NE breeze, keeping it clean. Tuesday the 8th follows with 5 ft from the ESE, period 8 seconds, and glassy conditions all day – another really good, clean day for the intermediate crew.
The next real standout comes on Monday the 14th of September. This is a big one. We’ve got a 12 ft SSE swell, period 12 seconds, and the combined energy is massive (3199). That’s strong to very strong wave energy. The wind is light and cross-off from the ENE, keeping it clean. This is excellent surf, but it’s for experienced surfers only – 12 ft is big, and the long period (12 seconds) means it’ll be powerful. Maresias being a beach break, that long period might make it a bit straight, but the quality is there. Tuesday the 15th still has 7 ft SE swell, period 11 seconds, with glassy conditions in the morning – another excellent day for the crew who can handle it.
After that, the swell backs off a bit, but Wednesday the 16th still has some energy, though the wind turns cross onshore, so it’s messy. Then Thursday the 17th is clean again with 4 ft SE swell, period 10 seconds – good conditions, but not the standout of the earlier days.
The last notable mention is Sunday the 20th of September. A 7 ft ESE swell, period 8 seconds, with light cross-off winds from the NE. The combined energy is moderate (690) and the report says “very good surf conditions.” It’s a solid end to the forecast window.
So, my pick for the best on offer is Monday the 14th – that 12 ft SSE groundswell with clean cross-off winds is a proper session for the experienced. The backup is Monday the 7th, with that 7 ft S swell and glassy morning. Crowds at Maresias are often an issue, so expect company, especially on the good days.
Rusty.
Short Range ForecastHeavy rain (total 48mm), heaviest during Sun morning. Warm (max 21°C on Sat morning, min 15°C on Sun afternoon). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Thu afternoon. Warm (max 24°C on Wed morning, min 18°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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) | SSE 10 | S 6 | S 10 | S 8 | S 7 | S 8 | S 10 | S 10 | S 10 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | S 12 | S 12 | S 12 | S 15 | S 13 | S 13 | S 12 |
Wave Graph | |||||||||||||||||||||
72 | 42 | 279 | 491 | 279 | 612 | 987 | 598 | 417 | 276 | 283 | 373 | 310 | 223 | 305 | 266 | 239 | 434 | 281 | 202 | 136 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-on | on | on | on | glassy | cross-off | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | glassy | cross | cross-off |
High Tide | 12:50PM0.91m | 8:48PM0.60m | 1:20PM1.02m | 00:36AM0.74m | 1:45PM1.09m | 00:53AM0.87m | 2:05PM1.13m | 1:15AM1.01m | 2:21PM1.14m | 1:42AM1.12m | 2:36PM1.13m | 2:10AM1.20m | 2:52PM1.12m | 2:40AM1.24m | |||||||
Low Tide | 6:00PM0.56m | 9:56PM0.59m | 5:25AM0.29m | 6:49PM0.48m | 6:25AM0.15m | 7:21PM0.42m | 7:12AM0.04m | 7:50PM0.37m | 7:51AM-0.03m | 8:16PM0.32m | 8:25AM-0.06m | 8:39PM0.28m | 8:56AM-0.03m | 9:01PM0.24m | |||||||
6:09 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:05 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:53 | — | |
mm | — | 1 | 11 | 19 | 4 | 10 | 2 | 1 | — | — | — | — | 2 | — | 2 | 2 | 8 | — | — | — | — |
Temp °C | 21 | 20 | 19 | 17 | 16 | 16 | 15 | 15 | 16 | 20 | 20 | 19 | 24 | 22 | 21 | 23 | 21 | 21 | 26 | 27 | 24 |
Feels °C | 23 | 22 | 21 | 16 | 15 | 14 | 15 | 15 | 16 | 20 | 21 | 21 | 27 | 25 | 23 | 27 | 25 | 23 | 29 | 29 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | S 6 | E 9 | ESE 8 | E 8 | E 8 | S 10 | S 10 | S 10 | S 10 | S 10 | ESE 8 | ESE 8 | ESE 8 | E 8 | S 12 | S 12 | S 15 | S 13 | S 13 | S 12 |
42 | 35 | 37 | 23 | 33 | 19 | 987 | 598 | 417 | 259 | 200 | 373 | 310 | 223 | 145 | 266 | 239 | 434 | 281 | 202 | 136 | |
Swell 2 Height (m) Direction Period (s) | E 8 | E 8 | E 9 | S 14 | S 13 | — | E 8 | E 8 | E 8 | S 18 | SSE 12 | S 10 | S 10 | S 9 | S 12 | E 8 | ESE 8 | SE 13 | E 7 | ESE 13 | ESE 12 |
49 | 50 | 53 | 16 | 14 | — | 10 | 10 | 11 | 6 | 52 | 158 | 90 | 87 | 305 | 93 | 75 | 7 | 40 | 16 | 14 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SE 10 | — | SSE 10 | — | — | S 19 | S 18 | — | S 16 | S 16 | S 15 | S 13 | E 14 | SE 14 | SSE 17 | ESE 13 | ESE 13 | ESE 13 | — |
72 | 42 | 27 | — | 10 | — | — | 7 | 6 | — | 5 | 5 | 17 | 90 | 4 | 7 | 100 | 17 | 17 | 16 | — | |
Wind waves Height (m) Direction Period (s) | — | — | S 10 | S 8 | S 7 | S 8 | — | — | NE 3 | ESE 8 | ESE 8 | E 8 | — | WSW 2 | — | — | — | E 8 | — | E 7 | ENE 4 |
— | — | 279 | 491 | 279 | 612 | — | — | 5 | 276 | 283 | 513 | — | 1 | — | — | — | 72 | — | 35 | 28 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 26 | 453 | 19 | 19 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 11 | 0 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Maresias Surf forecast
The above surf forecast table for Maresias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Maresias can be found by selecting the local surf guide option on the grey menu. Our Maresias 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 (Maresias) 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 Maresias 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.
Maresias is 14 km (9 miles) from Sao Sebastiao. If you plan a holiday in São Paulo, look for hotels and other accommodation in Sao Sebastiao. Sao Sebastiao has rooms for a wide range of budgets as well as car hire and transport links.










