Surf Forecasts:
Praia dos Castelhanos (Ilha Bela) surf forecast from 20 Aug 2026:
- Best quality surf: Friday 21 Aug, 3AM (local time) - 2ft (0.6m), 7s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 9PM (local time) - 7.5ft (2.3m), 16s period, SSE swell with 2,649 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 3AM (local time) - 2ft (0.6m), 7s period with E swell.
Best Forecast Surf Conditions for Praia dos Castelhanos (Ilha Bela) this week:
The surf forecast for Praia dos Castelhanos (Ilha Bela) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 3AM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.3m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Praia dos Castelhanos (Ilha Bela) in the next 16 days are 2.3m 16s and forecast to arrive on Monday (Aug 24) at 9PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Friday (Aug 21) at 9PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 21st Aug) | 2ft (0.6m) 7s |
| Best Surf | 3AM (Fri 21st Aug) | 2ft (0.6m) 7s |
| Most Powerful | 9PM (Mon 24th Aug) | 7.5ft (2.3m) 16s |
Table - best surf conditions forecast for Praia dos Castelhanos (Ilha Bela) over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Sat night. Warm (max 24°C on Thu night, min 18°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 26mm), heaviest during Sun afternoon. Very mild (max 19°C on Sun morning, min 17°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | E 7 | E 7 | E 7 | ESE 7 | ESE 8 | S 7 | S 10 | S 11 | S 10 | S 10 | S 10 | S 13 | SSE 14 | SSE 14 | SSE 16 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 13 | SSE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 26 | 26 | 24 | 73 | 45 | 102 | 374 | 441 | 296 | 235 | 244 | 408 | 1419 | 1969 | 2379 | 1517 | 1060 | 724 | 613 | 538 | 756 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross-on | cross-off | cross-off | cross-off | cross | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross | cross-on | on | cross-on |
High Tide | 6:01PM0.74m | 12:28PM0.74m | 6:49PM0.66m | 12:53PM0.84m | 00:10AM0.68m | 1:17PM0.93m | 00:43AM0.79m | 1:40PM1.01m | 1:08AM0.90m | 2:02PM1.07m | 1:31AM1.00m | 2:23PM1.11m | 1:55AM1.09m | ||||||||
Low Tide | 1:43PM0.62m | 2:32AM0.43m | 4:34PM0.64m | 4:32AM0.39m | 6:11PM0.56m | 5:48AM0.30m | 6:48PM0.47m | 6:38AM0.19m | 7:18PM0.39m | 7:18AM0.09m | 7:47PM0.32m | 7:53AM0.01m | 8:15PM0.27m | ||||||||
 | |  |  | | | | |  |  |  |  | |  |  | | | | | | | |
 | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 5:45 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:46 | — | — | 5:46 | — | — | 5:47 | — |
mm | — | — | — | — | — | — | — | — | 1 | 2 | 3 | 8 | 3 | — | 4 | 2 | 3 | 1 | — | — | — |
Temp °C | 22 | 22 | 24 | 24 | 20 | 19 | 19 | 19 | 18 | 19 | 19 | 18 | 17 | 18 | 18 | 19 | 19 | 19 | 20 | 21 | 20 |
Feels °C | 24 | 23 | 22 | 21 | 16 | 18 | 18 | 18 | 17 | 19 | 18 | 16 | 14 | 17 | 16 | 19 | 19 | 20 | 20 | 21 | 20 |
Swell 1 Height (m) Direction Period (s) | E 7 | E 7 | E 7 | ESE 7 | ESE 8 | S 7 | S 10 | S 11 | S 10 | S 10 | S 10 | S 13 | SSE 14 | SSE 14 | SSE 16 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 13 | SSE 14 |
| kJ | 26 | 26 | 24 | 73 | 45 | 102 | 374 | 441 | 296 | 235 | 244 | 408 | 1419 | 1969 | 2379 | 1517 | 1060 | 724 | 613 | 538 | 756 |
Swell 2 Height (m) Direction Period (s) | — | S 12 | S 10 | S 9 | S 15 | E 8 | E 8 | E 7 | E 7 | — | E 8 | S 13 | — | — | — | — | — | — | SSE 17 | SSE 16 | — |
| kJ | — | 10 | 19 | 15 | 4 | 33 | 11 | 4 | 9 | — | 1 | 130 | — | — | — | — | — | — | 243 | 232 | — |
Swell 3 Height (m) Direction Period (s) | SE 12 | — | SW 5 | — | — | S 14 | — | — | — | — | — | — | — | — | — | — | — | — | E 5 | — | — |
| kJ | 6 | — | 1 | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | — | 13 | — | — |
Wind waves Height (m) Direction Period (s) | WSW 3 | — | NNE 2 | — | SSW 6 | — | — | — | — | E 4 | E 4 | ESE 5 | ESE 5 | — | E 5 | E 5 | E 5 | E 5 | ESE 5 | ESE 6 | E 6 |
| kJ | 2 | — | 1 | — | 126 | — | — | — | — | 10 | 12 | 27 | 22 | — | 34 | 27 | 21 | 23 | 36 | 57 | 135 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 49 | 37 | 29 | 45 | 465 | 0 | 45 | 45 | 29 | 26 | 45 | 45 | 45 | 45 | 26 | 12 | 12 | 10 | 10 | 12 | 18 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the Praia dos Castelhanos (Ilha Bela) Surf forecast
The above surf forecast table for Praia dos Castelhanos (Ilha Bela) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Praia dos Castelhanos (Ilha Bela) can be found by selecting the local surf guide option on the grey menu. Our Praia dos Castelhanos (Ilha Bela) 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 (Praia dos Castelhanos (Ilha Bela)) 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 Praia dos Castelhanos (Ilha Bela) 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.
Praia dos Castelhanos (Ilha Bela) is 11 km (7 miles) from the city of Ilhabela. If you plan a holiday in São Paulo, look for hotels and other accommodation in Ilhabela. Ilhabela has rooms for a wide range of budgets as well as car hire and transport links.
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