Surf Forecasts:
Ilha surf forecast from 1 Sep 2026:
- Best quality surf: Thursday 3 Sep, 12AM (local time) - 4.5ft (1.4m), 11s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 6PM (local time) - 5ft (1.6m), 10s period, S swell with 509 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 9PM (local time) - 2.5ft (0.8m), 6s period with S swell.
Best Forecast Surf Conditions for Ilha this week:
The surf forecast for Ilha over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 01) at 9PM. The primary swell is predicted to be 0.5m and 9s period with a secondary swell of 0.8m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ilha in the next 16 days are 1.6m 10s and forecast to arrive on Monday (Sep 07) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 1st Sep) | 2.5ft (0.8m) 6s |
| Best Surf | 12AM (Thu 3rd Sep) | 4.5ft (1.4m) 11s |
| Most Powerful | 6PM (Mon 7th Sep) | 5ft (1.6m) 10s |
Table - best surf conditions forecast for Ilha over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's break down the next couple of weeks.
Honestly, it's a tough forecast. We've got a few windows where it might be worth a look, but you'll have to be smart about it. The water is sitting at 72°, which is a touch warmer than normal for this time of year, so that's a nice little bonus.
The standout is shaping up for the afternoon of Saturday, September 12th. It's a bit of a wait, but it's the one to aim for. We'll see a 4ft swell from the south, with a short period, but the wind is forecast to go glassy, dead calm. That means the reef at Ilha will be looking as clean as it gets. The combined wave energy will be moderate, and conditions should be good. It's a fairly consistent spot, and with the wind dropping off, the crowds are only a sometimes thing, so you might just get a few sets to yourself. That's the one to circle on the calendar.
Before that, there are a few other mornings to consider, but they're more for the dedicated. On the morning of Friday, September 4th, we'll see a 3ft SSE groundswell with glassy conditions. It's surfable, but pretty ordinary. The morning of Saturday, September 5th is similar, with a tiny 1ft SE swell, glassy wind, but very weak energy. It's a slow, small day.
The first week is mostly a washout. Tuesday the 1st sees a small 2ft S swell with a light cross-off breeze, but it's just ordinary. The wind turns onshore from the 2nd onwards, and the swell gets a bit of size but with poor conditions. By Monday the 7th, we see a stronger 6ft SSE swell, but it's cross-onshore and choppy, so it's a pass. For a reef break, that setup isn't doing anyone any favours.
The second week is a bit of a gamble. The morning of Tuesday the 15th has a 5ft ESE windswell with a moderate cross-onshore breeze—it's choppy and not great. The morning of Wednesday the 16th is similar, with a 5ft E windswell and a light cross breeze, but it's marginal at best.
So, to sum it up: hold out for the afternoon of Saturday, September 12th. That's the cleanest window. The rest of the run is full of choppy, onshore wind, or small, weak swells. It's not a total blank, but it's a game of patience.
Rusty, signing off.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue afternoon. Warm (max 26°C on Tue afternoon, min 17°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 44mm), heaviest during Sun afternoon. Warm (max 20°C on Fri afternoon, min 16°C on Sun afternoon). Wind will be generally light. | |||||||||||||||||||
Tue 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | ||||||||||||||
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 8 | S 6 | S 9 | SSE 10 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SE 11 | SE 10 | S 9 | S 6 | SSE 7 | SSE 6 | SSE 9 | S 10 | S 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 32 | 47 | 177 | 426 | 452 | 340 | 291 | 186 | 151 | 105 | 78 | 29 | 28 | 55 | 60 | 152 | 115 | 318 | 468 | 423 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | on | on | cross-off | glassy | cross-on | cross-off | glassy | cross-on | cross | cross | cross-on | on | on | on | on | on | cross-on | cross-on |
High Tide | 4:52PM1.06m | 5:17AM1.14m | 5:24PM0.95m | 6:07AM1.00m | 6:00PM0.83m | 7:19AM0.86m | 12:36PM0.81m | 6:48PM0.71m | 1:04PM0.96m | 8:59PM0.64m | 1:29PM1.07m | 00:40AM0.79m | 1:48PM1.15m | 00:53AM0.93m | ||||||
Low Tide | 10:52PM0.31m | 11:52AM0.46m | 10:51PM0.37m | 11:10AM0.64m | 1:57PM0.62m | 10:51PM0.44m | 10:17AM0.77m | 4:22PM0.66m | 10:57PM0.53m | 4:10AM0.44m | 6:03PM0.59m | 5:35AM0.31m | 6:52PM0.50m | 6:33AM0.16m | 7:25PM0.43m | |||||
 |  |  |  |  | | | | |  |  |  | |  | |  |  | | |  | |
 | — | — | 6:15 | — | — | 6:13 | — | — | 6:13 | — | — | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — |
 | 5:52 | — | — | 5:53 | — | — | 5:53 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — |
mm | 2 | 4 | 1 | — | — | — | — | — | — | — | — | — | 3 | 8 | 5 | 12 | 11 | 5 | 5 | 3 |
Temp °C | 26 | 19 | 20 | 20 | 19 | 19 | 21 | 20 | 21 | 20 | 20 | 20 | 19 | 19 | 18 | 16 | 16 | 16 | 16 | 17 |
Feels °C | 25 | 19 | 19 | 19 | 19 | 18 | 22 | 21 | 21 | 20 | 20 | 20 | 18 | 20 | 16 | 13 | 14 | 13 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | S 6 | S 9 | SSE 10 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | SSE 11 | S 6 | SE 10 | S 9 | S 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | S 10 |
| kJ | 32 | 47 | 177 | 426 | 452 | 340 | 291 | 186 | 151 | 105 | 78 | 15 | 28 | 55 | 20 | 7 | 6 | 6 | 6 | 423 |
Swell 2 Height (m) Direction Period (s) | ESE 7 | ESE 9 | SSE 10 | ESE 8 | ESE 8 | ESE 9 | — | ESE 5 | ESE 8 | ESE 8 | ESE 8 | SE 11 | ESE 8 | ESE 4 | E 5 | S 13 | — | — | — | — |
| kJ | 18 | 32 | 85 | 7 | 14 | 15 | — | 29 | 44 | 55 | 38 | 29 | 14 | 4 | 4 | 31 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SW 5 | SE 9 | ESE 9 | — | — | — | — | SE 9 | S 11 | S 10 | SSW 4 | ESE 8 | — | ESE 9 | ESE 8 | SE 10 | — | — | — | — |
| kJ | 1 | 3 | 16 | — | — | — | — | 3 | 2 | 2 | 5 | 23 | — | 7 | 7 | 4 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | — | — | — | ENE 4 | ESE 4 | — | — | — | — | — | S 6 | — | S 6 | SSE 7 | SSE 6 | SSE 9 | S 10 | — |
| kJ | 3 | — | — | — | — | 10 | 25 | — | — | — | — | — | 25 | — | 60 | 152 | 115 | 318 | 468 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 6 | 136 | 0 | 0 | 8 | 0 | 0 | 4 | 4 | 4 | 136 | 53 | 136 | 57 | 57 | 129 | 308 | 369 |
Best forecast wave conditions in São Paulo | ||||||||||||||||||||
Best forecast wave conditions in Brazil | ||||||||||||||||||||
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Information about the Ilha Surf forecast
The above surf forecast table for Ilha provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ilha can be found by selecting the local surf guide option on the grey menu. Our Ilha 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 (Ilha) 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 Ilha 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.
Are you planning a holiday in São Paulo? If you are looking for accommodation near Ilha, camping, hotels and holiday cottages in São Paulo, consider staying in Praia Grande which is 19 km (12 miles) away. Other places in and around São Paulo where you can find information about places to rent, and car hire include Bertioga which is 19 km (12 miles) away, Guaruja, Cubatao and Santos.
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