
Surf Forecasts:
Ilha surf forecast from 4 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 9AM (local time) - 6ft (1.9m), 7s period, E swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 6AM (local time) - 5ft (1.6m), 10s period, SSE swell with 555 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 3AM (local time) - 1.5ft (0.4m), 10s 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 Saturday (Sep 05) at 3AM. The primary swell is predicted to be 0.4m and 10s period with a secondary swell of 0.5m and 5s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Ilha in the next 16 days are 1.6m 10s and forecast to arrive on Monday (Sep 07) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Sep 09) at 6PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sat 5th Sep) | 1.5ft (0.4m) 10s |
| Best Surf | 9AM (Tue 8th Sep) | 6ft (1.9m) 7s |
| Most Powerful | 6AM (Mon 7th Sep) | 5ft (1.6m) 10s |
Table - best surf conditions forecast for Ilha over the next 16 days.
The Lowdown
Alright folks, it's Rusty here. Let's have a look at the surf forecast for Ilha. It's a bit of a mixed bag over the next 16 days, with some real hidden gems if you play your cards right.
The overall pattern is a slow start, a couple of small windows of clean surf, then a real pulse of energy from the south-east that could be something special for the experienced crew. The water temp is sitting at 71°F, which is a touch warmer than normal for this time of year, so you might not need the thickest rubber.
For the first week, don't get too excited. The first few days are small and messy. Saturday the 5th has a glimmer of hope in the morning, with a tiny 1ft south-south-east swell and glassy conditions. It's weak, with combined energy of only 80, but it's the only clean wave in the first few days. You'll be on a mini-mal, but at least the surface will be like a mirror.
The first real standout pops up on Monday the 7th in the afternoon. The wind goes glassy out of the north-east, and the swell bumps up to a clean 4ft from the south-south-east. The combined energy is moderate at 286, and it's a long 9-second period, so you'll get a bit of push. This is the best of the early stuff.
Then, Tuesday the 8th is a little ripper. The morning session is where it's at. The wind is glassy again, and the swell is a solid 6ft from the east. The combined energy is a strong 652, and it's a short period at 7 seconds, so it'll be a bit walled-up and punchy. It's a bit much for beginners, but intermediates will be having a ball. The afternoon stays clean but drops to 4ft. For a Tuesday, it feels like a weekday treat.
After that, we hit a lull. The wind and swell don't play nice for a good 4-5 days. The surf is either onshore, too small, or both. It's a bit of a dead zone.
Now, for the second week, the real talk is about Monday the 14th. This is the one you circle on the calendar. The morning looks absolutely mint. The wind is glassy, and the swell is a solid 6ft from the south-south-east. The combined energy is a powerful 1129, and the period is a very long 13 seconds. This is a proper groundswell. For a spot like Ilha (a reef break), this long-period energy can be a dream – nice, deep lines wrapping in. But be warned, at 6ft, this is for the experienced surfer only. The power is real. The crowd factor is worth noting too; Ilha can get busy, so for a Monday morning with conditions this good, expect a few cars in the carpark. This is the standout of the entire 16-day window.
The days after that fade back into smaller, cleaner, but less powerful waves. Saturday the 19th has a little 3ft south swell with a 12-second period and glassy morning conditions, which will be a nice way to finish the period if you missed the big one.
So, overall, don't bother paddling out until Monday the 7th afternoon. Then, make sure you're free for Tuesday the 8th morning. But the absolute non-negotiable session is Monday the 14th at dawn. Get there early, and bring your big-wave board.
Rusty.
Short Range ForecastHeavy rain (total 55mm), heaviest during Sat night. Warm (max 21°C on Fri afternoon, min 15°C on Sun morning). Winds increasing (calm on Fri night, fresh winds from the S by Sat night). | Days 5-7 Weather SummaryHeavy rain (total 25mm), heaviest during Wed morning. Warm (max 22°C on Wed night, min 16°C on Mon afternoon). Wind will be generally light. | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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 11 | SSE 10 | SSE 10 | SE 10 | S 10 | SSE 7 | S 7 | S 8 | SSE 10 | SSE 9 | S 10 | E 7 | ESE 7 | E 8 | ESE 8 | ESE 8 | ESE 7 | S 12 | S 12 | SSE 16 |
Wave Graph | ||||||||||||||||||||
105 | 42 | 42 | 27 | 153 | 228 | 264 | 512 | 482 | 280 | 121 | 381 | 134 | 403 | 103 | 72 | 51 | 98 | 110 | 81 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | glassy | cross-on | cross-on | on | on | on | cross-on | glassy | cross | glassy | glassy | glassy | cross-off | cross-on | glassy | glassy | cross-on | cross-on |
High Tide | 6:48PM0.71m | 1:04PM0.96m | 8:59PM0.64m | 1:29PM1.07m | 00:40AM0.79m | 1:48PM1.15m | 00:53AM0.93m | 2:04PM1.19m | 1:16AM1.08m | 2:19PM1.21m | 1:44AM1.20m | 2:35PM1.21m | 2:13AM1.29m | |||||||
Low Tide | 4:22PM0.66m | 10:57PM0.53m | 4:10AM0.44m | 6:03PM0.59m | 5:35AM0.31m | 6:52PM0.50m | 6:33AM0.16m | 7:25PM0.43m | 7:17AM0.04m | 7:54PM0.38m | 7:55AM-0.03m | 8:20PM0.33m | 8:29AM-0.06m | 8:43PM0.29m | ||||||
— | — | 6:11 | — | — | 6:11 | — | — | 6:09 | — | — | 6:09 | — | — | 6:07 | — | — | 6:07 | — | — | |
5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:55 | — | |
mm | — | 1 | 1 | — | 23 | 15 | 9 | 6 | — | — | — | — | — | 2 | 21 | 1 | 1 | — | 3 | 28 |
Temp °C | 21 | 20 | 20 | 20 | 20 | 17 | 16 | 16 | 16 | 16 | 17 | 18 | 19 | 19 | 19 | 21 | 22 | 22 | 21 | 21 |
Feels °C | 20 | 20 | 22 | 22 | 20 | 14 | 14 | 12 | 14 | 16 | 16 | 17 | 19 | 20 | 21 | 22 | 24 | 25 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SSE 10 | S 6 | SSE 6 | SSE 10 | ESE 8 | SSE 7 | SSE 8 | SSE 10 | SSE 9 | S 10 | ESE 7 | S 10 | ESE 7 | ESE 8 | ESE 8 | ESE 7 | S 12 | S 12 | S 12 |
49 | 42 | 25 | 26 | 100 | 6 | 176 | 385 | 482 | 280 | 117 | 164 | 73 | 157 | 103 | 72 | 48 | 98 | 110 | 71 | |
Swell 2 Height (m) Direction Period (s) | SSE 11 | ESE 8 | SSE 10 | SE 10 | ESE 9 | — | ESE 8 | ESE 8 | ESE 8 | — | S 18 | S 10 | SSE 13 | SSE 10 | S 10 | SSE 9 | SSE 12 | ESE 7 | ESE 7 | ESE 7 |
105 | 22 | 42 | 27 | 7 | — | 6 | 12 | 6 | — | 6 | 90 | 16 | 77 | 46 | 28 | 51 | 29 | 20 | 19 | |
Swell 3 Height (m) Direction Period (s) | S 10 | S 9 | ESE 8 | ESE 8 | SSE 10 | — | S 13 | — | — | — | — | SSE 13 | — | S 16 | S 15 | SSE 14 | SSE 9 | SE 14 | SE 13 | SSE 16 |
2 | 2 | 13 | 14 | 10 | — | 14 | — | — | — | — | 17 | — | 5 | 5 | 19 | 29 | 8 | 7 | 81 | |
Wind waves Height (m) Direction Period (s) | SSW 3 | SSW 4 | — | SE 6 | S 10 | SSE 7 | S 7 | S 8 | — | ESE 8 | ESE 6 | E 7 | ESE 7 | E 8 | — | — | — | — | — | E 3 |
1 | 5 | — | 26 | 153 | 228 | 264 | 512 | — | 6 | 121 | 381 | 134 | 403 | — | — | — | — | — | 5 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 6 | 4 | 0 | 63 | 129 | 214 | 2003 | 57 | 2 | 0 | 2 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 38 | 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.










