Surf Forecasts:
Castles surf forecast from 17 Aug 2026:
- Best quality surf: Saturday 22 Aug, 3AM (local time) - 5.5ft (1.7m), 10s period, ESE swell with cross-offshore winds.
- Most powerful swell: Saturday 22 Aug, 6PM (local time) - 10ft (3.0m), 9s period, S swell with 1,399 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 9PM (local time) - 3.5ft (1.1m), 8s period with S swell.
Best Forecast Surf Conditions for Castles this week:
The surf forecast for Castles 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 1.1m and 8s period with a secondary swell of 1.2m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 3.0m 9s and forecast to arrive on Saturday (Aug 22) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 9s period and expected on Saturday (Aug 22) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Fri 21st Aug) | 3.5ft (1.1m) 8s |
| Best Surf | 3AM (Sat 22nd Aug) | 5.5ft (1.7m) 10s |
| Most Powerful | 6PM (Sat 22nd Aug) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Castles over the next 16 days.
Short Range ForecastHeavy rain (total 35mm), heaviest during Wed night. Warm (max 28°C on Mon night, min 27°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryHeavy rain (total 47mm), heaviest during Thu night. Warm (max 28°C on Sat morning, min 26°C on Fri morning). Winds increasing (calm on Fri night, strong winds from the SE by Sun morning). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | ENE 10 | E 6 | E 6 | E 7 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 8 | ESE 7 | SSE 9 | SSE 8 | SSE 7 | SSE 7 | SSE 8 | SSE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 77 | 164 | 193 | 303 | 504 | 419 | 765 | 623 | 581 | 824 | 655 | 765 | 235 | 1162 | 727 | 545 | 508 | 1318 | 654 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | on | on | glassy | on | on | on | on | on | cross-on |
High Tide | 9:59PM2.05m | 10:35AM1.85m | 10:26PM1.99m | 11:22AM1.67m | 10:53PM1.92m | 12:25PM1.50m | 11:25PM1.84m | 2:21PM1.41m | 00:12AM1.77m | 4:51PM1.47m | 1:35AM1.72m | 5:34PM1.58m | |||||||
Low Tide | 4:22AM0.57m | 4:23PM0.87m | 5:06AM0.64m | 4:49PM1.05m | 5:57AM0.73m | 5:15PM1.21m | 7:03AM0.80m | 5:48PM1.34m | 8:29AM0.80m | 7:37PM1.44m | 9:50AM0.74m | 9:50PM1.41m | |||||||
 |  |  |  | |  |  | | | | | | | | | | | | | |
 | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | 7:04 | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | 1 | — | 2 | 3 | 7 | 14 | 2 | 6 | 17 | 10 | 2 | 2 | 8 | 3 | 3 | 2 | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 28 | 28 | 28 |
Feels °C | 30 | 29 | 28 | 28 | 28 | 27 | 28 | 29 | 28 | 27 | 29 | 29 | 32 | 33 | 28 | 27 | 27 | 28 | 29 |
Swell 1 Height (m) Direction Period (s) | SW 9 | SW 8 | SW 9 | SW 8 | SW 9 | SW 8 | S 9 | S 9 | S 10 | S 9 | SW 9 | SW 9 | ESE 7 | NE 9 | SW 9 | SW 10 | SW 10 | SW 10 | SW 10 |
| kJ | 104 | 71 | 73 | 55 | 36 | 25 | 81 | 74 | 94 | 235 | 257 | 199 | 235 | 3 | 430 | 489 | 391 | 279 | 270 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | S 7 | S 7 | S 7 | S 8 | S 8 | SW 8 | SW 9 | SSW 8 | SW 9 | — | — | SW 9 | E 14 | ENE 9 | E 13 | ENE 9 | ENE 8 | ENE 9 |
| kJ | 77 | 17 | 8 | 8 | 10 | 10 | 18 | 28 | 21 | 28 | — | — | 383 | 4 | 8 | 14 | 16 | 24 | 17 |
Swell 3 Height (m) Direction Period (s) | S 7 | ESE 10 | ESE 10 | ESE 10 | S 8 | SSW 8 | — | S 10 | SW 9 | — | — | — | S 8 | — | — | E 16 | E 13 | E 14 | E 13 |
| kJ | 17 | 11 | 10 | 10 | 1 | 6 | — | 8 | 29 | — | — | — | 132 | — | — | 5 | 14 | 16 | 32 |
Wind waves Height (m) Direction Period (s) | ESE 5 | E 6 | E 6 | E 7 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 8 | SE 8 | SE 8 | SE 8 | — | SSE 9 | SSE 8 | SSE 7 | SSE 7 | SSE 8 | SSE 8 |
| kJ | 42 | 164 | 193 | 303 | 504 | 419 | 765 | 623 | 581 | 824 | 655 | 765 | — | 1162 | 727 | 545 | 508 | 1318 | 654 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 28 | 29 | 31 | 29 | 770 | 596 | 588 | 28 | 596 | 588 | 28 | 28 | 0 | 28 | 624 | 588 | 776 | 588 | 28 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castles surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Castles Surf forecast
The above surf forecast table for Castles provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castles can be found by selecting the local surf guide option on the grey menu. Our Castles 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 (Castles) 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 Castles 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.
Castles is 6 km (4 miles) from the city of Itoman. If you plan a holiday in Okinawa, look for hotels and other accommodation in Itoman. Itoman has rooms for a wide range of budgets as well as car hire and transport links.
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