Surf Forecasts:
Ilha surf forecast from 23 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 9PM (local time) - 5ft (1.6m), 15s period, SSE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 9PM (local time) - 5.5ft (1.7m), 15s period, SSE swell with 1,275 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 9AM (local time) - 3.5ft (1.1m), 16s 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 Wednesday (Aug 26) at 9AM. The primary swell is predicted to be 1.1m and 16s period with a secondary swell of 1.0m and 12s. Another secondary swell of 1.1m and 5s 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 1.7m 15s and forecast to arrive on Monday (Aug 24) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Saturday (Aug 29) at 12PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 26th Aug) | 3.5ft (1.1m) 16s |
| Best Surf | 9PM (Wed 26th Aug) | 5ft (1.6m) 15s |
| Most Powerful | 9PM (Mon 24th Aug) | 5.5ft (1.7m) 15s |
Table - best surf conditions forecast for Ilha over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s have a look at what’s on the menu for the next couple of weeks.
Right off the bat, we’ve got a bit of a slow start, but the first real session is worth getting out of bed for. Sunday the 23rd of August is looking glassy clean at Ilha, a reef break that’s exposed to the swell. The water is a touch warmer than normal for this time of year at 22°, a nice little bonus. We’re looking at a clean 4ft swell pushing in from the south with a 10-second period. The combined energy is 226, so nothing huge, but it’s got some push. The wind is dead calm, glassy conditions. Expect good surf conditions. This is your window for a cruisey, fun session.
By Sunday afternoon, the wind shifts cross-onshore from the ESE at 9 mph and it gets messy. Forget it.
Monday the 24th and Tuesday the 25th are a write-off. The swell jumps up to 6ft, which is a bit more size, but the wind is howling cross-onshore and the conditions are choppy and poor. The combined energy spikes to 1206 (Monday morning) and 1058 (Monday afternoon), which is a lot of power, but it’s all wasted with the wind.
Wednesday the 26th of August brings a gem. The morning is glassy again with a light NNE breeze at 3 mph. The swell is 4ft from the SSE, but the period is a very long 16 seconds – that’s proper groundswell. This long period stuff will wrap in nicely at this reef, giving you some real shape. Combined energy is 962 (moderate). The forecast says “expect very good surf conditions.” This is the standout of the whole period. Don’t miss it.
The rest of the week into the weekend is a bit of a mixed bag. We get some clean, glassy conditions on Saturday the 29th of August with 3ft swell, but it's small and weak (energy at 94-104). Surfable but ordinary. The following week from the 30th of August through the 3rd of September is mostly a bust with poor winds and messy seas. The swell tries to pick up again on the 2nd of September with 5ft and combined energy of 545, but the wind is all wrong, making it a choppy, cross-onshore mess.
There’s a bit of a reprieve at the very end of the forecast. Sunday the 6th of September is looking promising. The morning is glassy with 4ft swell from the SE, period of 11 seconds, and combined energy of 286. The forecast says “expect good surf conditions.” That’s a long way out, so keep an eye on it, but it’s a nice little light at the end of the tunnel.
The bottom line: The best surf is on the Wednesday morning of the 26th of August. That long-period groundswell with glassy conditions is your ticket. The Sunday the 6th of September also has potential if you’re patient.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Sun night. Warm (max 20°C on Sun morning, min 18°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Thu afternoon. Warm (max 28°C on Fri night, min 20°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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) | S 10 | S 10 | SSE 13 | SSE 14 | SSE 13 | SSE 14 | S 14 | S 13 | S 13 | SSE 16 | SSE 15 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | E 8 | ESE 7 | ESE 7 | ESE 8 | ESE 9 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 225 | 255 | 590 | 1206 | 1058 | 1240 | 736 | 591 | 461 | 575 | 1088 | 1074 | 789 | 615 | 303 | 258 | 160 | 72 | 82 | 84 | 77 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | glassy | cross-on | cross-off | cross | cross-on | cross | cross | cross | cross-off | glassy | glassy | cross |
High Tide | 1:28PM0.99m | 00:51AM0.86m | 1:47PM1.08m | 1:13AM0.98m | 2:06PM1.15m | 1:35AM1.10m | 2:24PM1.21m | 1:59AM1.20m | 2:43PM1.25m | 2:25AM1.28m | 3:04PM1.26m | 2:53AM1.34m | 3:28PM1.26m | ||||||||
Low Tide | 6:54PM0.50m | 6:47AM0.21m | 7:25PM0.41m | 7:26AM0.10m | 7:54PM0.33m | 8:01AM0.01m | 8:23PM0.27m | 8:35AM-0.05m | 8:52PM0.23m | 9:07AM-0.07m | 9:21PM0.21m | 9:39AM-0.04m | 9:48PM0.21m | ||||||||
 |  |  |  | |  |  | | | | | |  | |  | | | | | |  | |
 | 6:24 | — | — | 6:22 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — |
 | — | 5:50 | — | — | 5:51 | — | — | 5:51 | — | — | 5:51 | — | — | 5:52 | — | — | 5:52 | — | — | 5:52 | — |
mm | — | — | 4 | 2 | 2 | 4 | — | — | 1 | — | — | 1 | 1 | 2 | — | — | — | — | — | — | — |
Temp °C | 20 | 20 | 19 | 18 | 18 | 18 | 19 | 20 | 20 | 20 | 21 | 21 | 23 | 22 | 22 | 25 | 26 | 28 | 37 | 36 | 27 |
Feels °C | 19 | 18 | 17 | 16 | 16 | 16 | 18 | 19 | 18 | 22 | 22 | 23 | 24 | 25 | 25 | 25 | 25 | 27 | 36 | 37 | 28 |
Swell 1 Height (m) Direction Period (s) | S 10 | S 10 | SSE 13 | SSE 14 | SSE 13 | SSE 14 | S 14 | S 13 | S 13 | SSE 16 | SSE 15 | SSE 15 | SSE 14 | SSE 14 | SSE 13 | ESE 7 | ESE 7 | ESE 7 | ESE 8 | ESE 9 | ESE 9 |
| kJ | 225 | 255 | 590 | 1206 | 1058 | 1240 | 736 | 591 | 461 | 575 | 1088 | 1074 | 789 | 615 | 303 | 86 | 104 | 72 | 82 | 84 | 77 |
Swell 2 Height (m) Direction Period (s) | E 7 | E 7 | E 8 | — | — | — | — | — | SSE 17 | S 12 | ESE 5 | ESE 5 | ESE 6 | ESE 6 | ESE 6 | SSE 12 | SSE 12 | SSE 11 | SSE 11 | SSE 10 | SSE 10 |
| kJ | 1 | 1 | 1 | — | — | — | — | — | 216 | 289 | 23 | 23 | 21 | 22 | 48 | 152 | 79 | 40 | 22 | 10 | 10 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | ESE 5 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | 29 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | E 7 | — | — | E 4 | E 4 | E 4 | ESE 5 | E 5 | — | — | — | — | E 6 | E 8 | ESE 7 | — | N 3 | NW 4 | NNW 2 |
| kJ | — | — | 1 | — | — | 8 | 13 | 9 | 42 | 69 | — | — | — | — | 80 | 258 | 160 | — | 5 | 6 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 15 | 15 | 57 | 57 | 15 | 8 | 15 | 8 | 0 | 2 | 0 | 2 | 113 | 2 | 2 | 8 | 0 | 0 | 0 | 4 |
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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