Surf Forecasts:
Itamambuca surf forecast from 21 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 9AM (local time) - 6ft (1.9m), 14s period, SSE swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 12AM (local time) - 7ft (2.1m), 15s period, SSE swell with 1,976 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 4ft (1.2m), 7s period with S swell.
Best Forecast Surf Conditions for Itamambuca this week:
The surf forecast for Itamambuca over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 9PM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.6m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Itamambuca in the next 16 days are 2.1m 15s and forecast to arrive on Tuesday (Aug 25) at 12AM. 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 (Fri 21st Aug) | 4ft (1.2m) 7s |
| Best Surf | 9AM (Tue 25th Aug) | 6ft (1.9m) 14s |
| Most Powerful | 12AM (Tue 25th Aug) | 7ft (2.1m) 15s |
Table - best surf conditions forecast for Itamambuca over the next 16 days.
The Lowdown
Alright, look, I’m gonna level with you. The next 16 days here at Itamambuca start off a bit flat and messy, and we’ve got a long wait before anything really gets going. The first week or so is pretty ordinary, with a lot of poor conditions and swell direction that doesn't suit this river mouth setup at all. The early mornings on the 22nd and 23rd give a glimpse of something better, but the wind and conditions on those afternoons just kill it.
The real standout window, the one that’s got my attention, is around Tuesday the 25th. That morning we’re looking at a solid 6ft groundswell pushing in from the SSE with a period of 14 seconds. That’s serious energy (1464), and the wind is glassy out of the ESE – just 3 mph. That’ll have Chocks (Itamambuca) looking smooth and lined up. The water is much warmer than usual for this time of year, sitting at 73°, so that’s a nice bonus. It’s a river break, so that long-period swell will wrap in nicely, giving you good shape. Be mindful though, the wave size is into the 6ft range, so it’s not one for the grommets or learners. The afternoon stays good too, with 5ft and glassy wind, so you can surf through the day.
The following days, the 26th and 27th, still have some size but the wind conditions get a bit more questionable. You might get a decent morning session on the 27th with 5ft swell and glassy wind, but the energy drops a bit. After that, the surf fades away significantly from the 30th onward, with tiny 2ft to 3ft swell and mostly onshore wind patterns. There’s a bit more energy trying to come in around the 3rd and 4th of September, but the conditions look poor, and the wind is just all wrong. The long-range call for the 3rd and 4th has some size (6ft on the 3rd afternoon, for instance), but with high uncertainty and cross-shore wind, it’s nothing to get excited about yet.
So, to put it plainly: if you’ve got a window, make it Tuesday the 25th. That’s the day. The rest of the first week is underwhelming, and the second week looks even quieter. It’s one of those forecasts where you wait for one good day, and you jump on it.
Stay stoked.
- Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Sun night. Warm (max 28°C on Fri morning, min 17°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Mon morning. Warm (max 22°C on Tue morning, min 18°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | ESE 7 | SSW 6 | S 7 | S 11 | S 11 | S 10 | S 10 | S 10 | S 13 | S 13 | SSE 14 | SSE 15 | SSE 14 | S 14 | S 13 | S 12 | S 12 | SSE 14 | SSE 13 | SSE 14 | SSE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 89 | 113 | 131 | 451 | 434 | 347 | 279 | 302 | 466 | 728 | 1587 | 1976 | 1443 | 849 | 573 | 432 | 353 | 661 | 663 | 604 | 415 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | off | glassy | on | cross-on | glassy | on | on | on | on | cross-on | glassy | glassy | glassy | glassy | on | glassy | glassy | cross-on | glassy |
High Tide | 12:23PM0.73m | 6:44PM0.68m | 12:55PM0.83m | 00:18AM0.68m | 1:21PM0.92m | 00:50AM0.79m | 1:46PM1.00m | 1:15AM0.90m | 2:09PM1.06m | 1:37AM1.00m | 2:29PM1.11m | 1:58AM1.09m | 2:47PM1.13m | 2:22AM1.17m | |||||||
Low Tide | 4:03PM0.64m | 4:21AM0.39m | 5:55PM0.57m | 5:43AM0.31m | 6:44PM0.48m | 6:37AM0.20m | 7:17PM0.40m | 7:19AM0.09m | 7:47PM0.32m | 7:55AM0.01m | 8:17PM0.26m | 8:30AM-0.05m | 8:48PM0.22m | ||||||||
 | |  |  | | |  |  |  |  |  |  | | |  | | | | | |  | |
 | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — | 6:16 | — | — | 6:16 | — | — | 6:15 | — | — |
 | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — |
mm | — | — | — | — | — | — | — | 1 | 9 | 6 | 5 | 4 | — | 1 | — | — | — | — | — | — | — |
Temp °C | 28 | 23 | 18 | 19 | 19 | 18 | 21 | 20 | 19 | 18 | 18 | 18 | 22 | 20 | 20 | 22 | 22 | 21 | 24 | 24 | 22 |
Feels °C | 27 | 22 | 18 | 20 | 19 | 19 | 21 | 21 | 20 | 18 | 18 | 18 | 23 | 22 | 22 | 24 | 24 | 24 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | ESE 7 | E 8 | S 7 | S 11 | S 11 | S 10 | S 10 | S 10 | S 13 | S 13 | SSE 14 | SSE 15 | SSE 14 | S 14 | S 13 | S 12 | S 12 | SSE 14 | SSE 13 | SSE 14 | SSE 14 |
| kJ | 89 | 55 | 131 | 451 | 434 | 347 | 279 | 302 | 466 | 728 | 1587 | 1976 | 1443 | 849 | 573 | 432 | 353 | 661 | 663 | 604 | 415 |
Swell 2 Height (m) Direction Period (s) | S 9 | — | E 8 | E 8 | E 7 | E 7 | E 7 | E 7 | E 7 | E 7 | — | S 16 | — | — | — | ESE 5 | SSE 15 | ESE 6 | ESE 6 | ESE 6 | ESE 6 |
| kJ | 15 | — | 31 | 11 | 8 | 4 | 4 | 4 | 4 | 1 | — | 928 | — | — | — | 21 | 263 | 24 | 28 | 47 | 55 |
Swell 3 Height (m) Direction Period (s) | SW 7 | — | — | — | — | — | — | E 8 | — | — | — | — | — | — | — | SSE 16 | ESE 5 | — | — | SSE 16 | — |
| kJ | 2 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 173 | 22 | — | — | 280 | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SSW 6 | — | — | — | — | E 3 | ESE 4 | SE 4 | E 4 | — | — | E 4 | ESE 5 | ESE 5 | — | — | E 6 | — | — | E 6 |
| kJ | 1 | 113 | — | — | — | — | 3 | 4 | 23 | 9 | — | — | 21 | 22 | 25 | — | — | 32 | — | — | 128 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 519 | 0 | 0 | 85 | 9 | 0 | 34 | 85 | 34 | 34 | 9 | 0 | 0 | 0 | 0 | 4 | 0 | 0 | 16 | 0 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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Information about the Itamambuca Surf forecast
The above surf forecast table for Itamambuca provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Itamambuca can be found by selecting the local surf guide option on the grey menu. Our Itamambuca 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 (Itamambuca) 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 Itamambuca 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.
Itamambuca is 8 km (5 miles) from Ubatuba. If you plan a holiday in São Paulo, look for hotels and other accommodation in Ubatuba. Ubatuba has rooms for a wide range of budgets as well as car hire and transport links.
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