Surf Forecasts:
Ilha surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 20 Sep, 3AM (local time) - 6ft (1.8m), 9s period, E swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 12AM (local time) - 6ft (1.9m), 8s period, E swell with 505 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 12AM (local time) - 3.5ft (1.1m), 6s period with SSE 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 Monday (Sep 14) at 12AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.9m and 7s. Another secondary swell of 0.2m and 9s is also forecast. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ilha in the next 16 days are 1.9m 8s and forecast to arrive on Sunday (Sep 20) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 14th Sep) | 3.5ft (1.1m) 6s |
| Best Surf | 3AM (Sun 20th Sep) | 6ft (1.8m) 9s |
| Most Powerful | 12AM (Sun 20th Sep) | 6ft (1.9m) 8s |
Table - best surf conditions forecast for Ilha over the next 16 days.
The Lowdown
Alright, surfers, Rusty here with a look at what's coming up for Ilha over the next couple of weeks. Gotta be straight with you – it's a tough stretch ahead, so don't get your hopes up too high.
The water is sitting at a balmy 72°, which is much warmer than normal for this time of year, so at least you won't be freezing your arse off while you're scratching for scraps.
We’re looking at a pretty blank run to start. There’s nothing worthwhile on offer until September 20th. That's a solid seven-day gap of poor conditions with messy winds and weak swell.
The first real glimmer of hope comes on Sunday the 20th. The morning is your best bet, with a clean 4ft swell pushing in from the ESE and a cross-offshore breeze from the NE. The wave energy is moderate (210) and it should be rideable, if not world-class. Later that Sunday arvo, the wind goes glassy, which is a beautiful thing, but the swell drops to 3ft and the energy drops right off (148). It’s surfable, but you’ll be working for it.
Monday the 21st keeps the clean conditions with a cross-offshore breeze in the morning, but the swell is down to 3ft (100 energy). It’s clean, but tiny. Tuesday the 22nd is more of the same – clean, small 2ft waves with a light offshore wind. The energy is weak at just 67.
After that little window, it falls apart again. From September 23rd through to the end of the period, it’s back to poor conditions with onshore or cross-shore winds and weak, messy swell. September 25th starts with a glassy 3ft SSE swell in the morning (189 energy), which is a tease, but it’s labelled as "surfable but very ordinary."
Honestly, the standout here is the Sunday morning, the 20th. It’s the only time you get a clean 4ft+ wave with a good wind. It’s an exposed reef break (Ilha), and the optimum swell is from the SE, so that ESE swell on the 20th is a decent match. But this is a reef, and it's fairly consistent, so it can handle a bit of swell. Keep in mind, crowds are possible here sometimes. If you’re a beginner, those 2ft to 3ft days are your window, but the 4ft on the 20th might be a bit of a push.
Overall, it’s a grim outlook for Ilha. That one clean morning on the 20th is the only thing worth paddling out for. After that, you’re better off waiting for the next system.
Rusty.
Short Range ForecastHeavy rain (total 62mm), heaviest during Sun night. Very mild (max 18°C on Sun night, min 17°C on Sun afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Wed afternoon. Warm (max 20°C on Fri afternoon, min 18°C on Wed afternoon). Winds decreasing (fresh winds from the E on Thu afternoon, calm by Fri night). | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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) | S 8 | SSE 6 | S 7 | S 7 | S 11 | S 10 | S 9 | SSE 8 | SSE 8 | SSE 12 | SSE 9 | SSE 10 | S 11 | S 11 | S 11 | ESE 6 | ESE 7 | ESE 8 | E 8 | E 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 98 | 94 | 86 | 66 | 151 | 70 | 106 | 82 | 92 | 236 | 254 | 301 | 377 | 181 | 151 | 113 | 204 | 142 | 422 | 505 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-on | cross | cross | cross | cross | glassy | cross-on | on | cross-on | cross | cross-on | cross | cross-on | cross-on | cross | cross | cross-on | cross |
High Tide | 3:31PM1.15m | 3:44AM1.28m | 3:52PM1.12m | 4:15AM1.20m | 4:13PM1.07m | 4:47AM1.09m | 4:35PM1.00m | 5:22AM0.97m | 4:59PM0.92m | 6:08AM0.84m | 5:30PM0.83m | 1:04AM0.48m | 7:31AM0.73m | 12:47PM0.80m | 6:28PM0.72m | |||||
Low Tide | 9:38PM0.19m | 10:06AM0.24m | 9:56PM0.19m | 10:20AM0.35m | 10:14PM0.21m | 10:30AM0.46m | 10:34PM0.27m | 10:29AM0.56m | 10:54PM0.36m | 10:09AM0.65m | 11:07PM0.47m | 9:18AM0.72m | 4:27PM0.70m | 10:48PM0.60m | ||||||
 |  | | |  |  |  | |  | |  |  | |  | | | | | | | |
 | — | — | 6:03 | — | — | 6:01 | — | — | 6:01 | — | — | 6:00 | — | — | 5:58 | — | — | 5:58 | — | — |
 | 5:57 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 5:59 | — |
mm | 10 | 18 | 9 | 7 | 7 | — | 1 | 8 | 2 | 2 | 1 | — | — | — | — | — | 1 | — | 3 | 12 |
Temp °C | 17 | 18 | 18 | 18 | 18 | 17 | 17 | 18 | 18 | 18 | 18 | 19 | 19 | 18 | 19 | 20 | 20 | 20 | 20 | 21 |
Feels °C | 18 | 17 | 19 | 16 | 18 | 16 | 17 | 18 | 18 | 17 | 15 | 16 | 15 | 14 | 20 | 20 | 21 | 21 | 20 | 21 |
Swell 1 Height (m) Direction Period (s) | S 8 | SSE 7 | S 7 | S 7 | S 11 | SE 8 | S 9 | SSE 8 | SSE 8 | SSE 12 | SSE 9 | SSE 10 | S 11 | S 11 | S 11 | S 10 | S 10 | ESE 8 | ESE 8 | ESE 8 |
| kJ | 98 | 89 | 86 | 66 | 151 | 58 | 106 | 82 | 40 | 236 | 254 | 301 | 377 | 181 | 151 | 104 | 71 | 142 | 133 | 143 |
Swell 2 Height (m) Direction Period (s) | ESE 8 | ESE 9 | ESE 4 | ESE 5 | SE 8 | S 10 | SE 8 | SSE 10 | S 10 | ESE 7 | ESE 7 | SSE 13 | — | — | — | — | — | S 9 | SSE 9 | SSE 9 |
| kJ | 6 | 7 | 11 | 7 | 67 | 70 | 51 | 21 | 56 | 11 | 9 | 59 | — | — | — | — | — | 44 | 28 | 16 |
Swell 3 Height (m) Direction Period (s) | E 11 | S 14 | SSE 13 | SSE 12 | SE 9 | SSE 8 | SSE 11 | ESE 7 | SSE 13 | SE 9 | SSE 15 | ESE 10 | — | — | — | — | — | S 14 | S 13 | SSE 12 |
| kJ | 2 | 4 | 34 | 49 | 3 | 47 | 24 | 11 | 55 | 12 | 22 | 10 | — | — | — | — | — | 4 | 14 | 13 |
Wind waves Height (m) Direction Period (s) | — | SSE 6 | — | ESE 6 | — | SSW 5 | — | — | SSE 8 | — | — | ESE 7 | ESE 4 | ESE 6 | ESE 6 | ESE 6 | ESE 7 | — | E 8 | E 8 |
| kJ | — | 94 | — | 52 | — | 15 | — | — | 92 | — | — | 5 | 29 | 91 | 85 | 113 | 204 | — | 422 | 505 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 57 | 0 | 8 | 16 | 16 | 4 | 4 | 0 | 38 | 8 | 15 | 8 | 57 | 8 | 2 | 2 | 2 | 2 | 8 | 2 |
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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