Surf Forecasts:
Praia dos Castelhanos (Ilha Bela) surf forecast from 16 Sep 2026:
- Best quality surf: Monday 21 Sep, 12AM (local time) - 3ft (0.9m), 8s period, ESE swell with cross-offshore winds.
- Most powerful swell: Sunday 20 Sep, 6AM (local time) - 7.5ft (2.3m), 8s period, E swell with 665 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 12AM (local time) - 3ft (0.9m), 8s period with ESE 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 Monday (Sep 21) at 12AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.2m and 12s. 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 8s and forecast to arrive on Sunday (Sep 20) at 6AM. Winds are predicted to be 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 Tuesday (Sep 22) at 3PM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 21st Sep) | 3ft (0.9m) 8s |
| Best Surf | 12AM (Mon 21st Sep) | 3ft (0.9m) 8s |
| Most Powerful | 6AM (Sun 20th Sep) | 7.5ft (2.3m) 8s |
Table - best surf conditions forecast for Praia dos Castelhanos (Ilha Bela) over the next 16 days.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed morning. Warm (max 20°C on Fri morning, min 18°C on Wed afternoon). Winds increasing (light winds from the S on Wed morning, fresh winds from the ENE by Fri night). | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Mon night. Warm (max 27°C on Mon morning, min 19°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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) | SSE 13 | SSE 12 | SSE 9 | SSE 9 | S 11 | S 12 | S 11 | ESE 6 | E 7 | ESE 7 | ESE 7 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 95 | 115 | 208 | 164 | 297 | 132 | 154 | 155 | 302 | 178 | 197 | 280 | 237 | 163 | 105 | 116 | 92 | 96 | 51 | 51 | 54 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | on | on | on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-off | glassy | on | cross-off | cross-on | off | cross-on |
High Tide | 4:25PM0.91m | 5:17AM0.88m | 4:48PM0.84m | 6:03AM0.76m | 5:16PM0.76m | 12:15PM0.75m | 6:05PM0.66m | 12:31PM0.85m | 11:53PM0.70m | 12:51PM0.94m | 00:19AM0.82m | 1:11PM1.02m | 00:42AM0.94m | ||||||||
Low Tide | 10:45AM0.44m | 10:48PM0.26m | 10:52AM0.55m | 11:22PM0.34m | 10:01AM0.64m | 1:52AM0.43m | 4:12PM0.65m | 10:38PM0.57m | 4:05AM0.40m | 5:36PM0.56m | 5:20AM0.30m | 6:12PM0.46m | 6:09AM0.19m | 6:44PM0.37m | |||||||
 |  |  | | |  |  | |  | | |  | |  | |  | |  |  | | | |
 | 5:56 | — | — | 5:56 | — | — | 5:54 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — |
 | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — |
mm | 1 | — | — | — | — | — | — | — | 2 | — | — | 2 | — | 2 | — | — | — | 8 | 1 | 1 | 5 |
Temp °C | 19 | 18 | 18 | 18 | 18 | 19 | 20 | 20 | 19 | 20 | 20 | 20 | 23 | 24 | 23 | 27 | 27 | 25 | 26 | 22 | 21 |
Feels °C | 18 | 16 | 17 | 16 | 15 | 18 | 18 | 18 | 16 | 19 | 18 | 19 | 24 | 25 | 24 | 29 | 28 | 27 | 28 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 7 | SSE 9 | SSE 9 | S 11 | S 12 | S 11 | S 11 | S 10 | S 10 | SSE 9 | S 9 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 | ESE 8 |
| kJ | 88 | 104 | 208 | 164 | 297 | 132 | 154 | 112 | 73 | 47 | 29 | 15 | 237 | 163 | 105 | 116 | 92 | 96 | 51 | 51 | 54 |
Swell 2 Height (m) Direction Period (s) | SSE 13 | SSE 12 | SSE 15 | SSE 13 | ESE 10 | S 8 | SE 9 | — | — | S 15 | S 14 | SSE 13 | SSE 13 | SSE 13 | S 12 | S 12 | S 11 | S 10 | N 3 | S 9 | SSW 3 |
| kJ | 95 | 115 | 44 | 135 | 58 | 51 | 23 | — | — | 4 | 4 | 16 | 32 | 32 | 12 | 11 | 9 | 8 | 1 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | S 10 | ESE 11 | ESE 12 | ESE 8 | SE 8 | SE 10 | — | — | — | — | — | SSW 9 | S 9 | — | E 14 | — | — | SE 14 | S 9 | SE 14 | S 12 |
| kJ | 31 | 13 | 13 | 11 | 3 | 24 | — | — | — | — | — | 16 | 6 | — | 4 | — | — | 8 | 7 | 7 | 3 |
Wind waves Height (m) Direction Period (s) | S 5 | — | — | ESE 11 | ESE 4 | E 5 | ESE 6 | ESE 6 | E 7 | ESE 7 | ESE 7 | ESE 8 | — | — | — | — | — | — | — | SW 3 | — |
| kJ | 16 | — | — | 153 | 20 | 42 | 52 | 155 | 302 | 178 | 197 | 280 | — | — | — | — | — | — | — | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 43 | 45 | 26 | 26 | 26 | 18 | 26 | 29 | 26 | 26 | 29 | 26 | 10 | 29 | 0 | 0 | 12 | 0 | 29 | 0 | 12 |
Best forecast wave conditions in São Paulo | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
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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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