
Surf Forecasts:
Castles surf forecast from 9 Aug 2026:
- Best quality surf: Thursday 13 Aug, 3PM (local time) - 2.5ft (0.8m), 10s period, ENE swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 3AM (local time) - 7ft (2.2m), 9s period, SSE swell with 809 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 3PM (local time) - 2.5ft (0.8m), 10s period with ENE 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 Thursday (Aug 13) at 3PM. The primary swell is predicted to be 0.8m and 10s period with a secondary swell of 0.9m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 2.2m 9s and forecast to arrive on Monday (Aug 10) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 10s period and expected on Sunday (Aug 09) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Thu 13th Aug) | 2.5ft (0.8m) 10s |
| Best Surf | 3PM (Thu 13th Aug) | 2.5ft (0.8m) 10s |
| Most Powerful | 3AM (Mon 10th Aug) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Castles over the next 16 days.
Short Range ForecastModerate rain (total 19mm), heaviest on Sun night. Warm (max 29°C on Sun afternoon, min 28°C on Sun morning). Winds decreasing (strong winds from the SSE on Sun morning, light winds from the SSE by Tue night). | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Wed night. Warm (max 29°C on Wed morning, min 27°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | S 9 | S 10 | E 14 | E 14 | SSE 10 | S 10 | ENE 12 | SSE 10 | S 9 | S 9 | ENE 11 | SSE 9 | ENE 10 | ENE 10 | S 8 | S 8 | S 8 | ENE 9 | ENE 11 | ENE 11 | ENE 10 |
Wave Graph | |||||||||||||||||||||
2104 | 2646 | 250 | 637 | 608 | 724 | 373 | 250 | 162 | 229 | 167 | 106 | 111 | 109 | 107 | 86 | 63 | 28 | 66 | 91 | 123 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | off | cross-on | glassy | cross-on | on | on | on | on |
High Tide | 5:19PM1.70m | 3:48AM2.00m | 6:09PM1.83m | 5:02AM2.13m | 6:49PM1.95m | 6:02AM2.25m | 7:24PM2.04m | 6:54AM2.33m | 7:58PM2.11m | 7:42AM2.35m | 8:31PM2.14m | 8:26AM2.31m | 9:01PM2.13m | ||||||||
Low Tide | 10:03AM0.46m | 10:04PM1.31m | 11:10AM0.32m | 11:16PM1.17m | 12:04PM0.20m | 00:10AM1.00m | 12:51PM0.13m | 00:56AM0.82m | 1:33PM0.13m | 1:40AM0.68m | 2:12PM0.19m | 2:21AM0.57m | 2:49PM0.32m | ||||||||
5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | |
— | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | |
mm | 4 | 2 | 5 | 3 | 1 | 2 | — | — | 2 | — | 1 | 3 | 2 | 3 | 1 | 1 | 1 | 2 | 1 | — | 3 |
Temp °C | 28 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 29 | 29 | 28 |
Feels °C | 26 | 28 | 27 | 31 | 31 | 31 | 33 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 32 | 33 | 33 | 31 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | WSW 11 | W 12 | W 11 | SSW 11 | SW 11 | S 10 | SW 10 | SSW 10 | SW 9 | SW 9 | SW 9 | SW 9 | SW 8 | SW 8 | SW 9 | SW 8 | SW 8 | SW 9 | SSW 8 | SW 9 | SSW 9 |
2522 | 1288 | 267 | 2372 | 1371 | 724 | 488 | 348 | 278 | 266 | 196 | 145 | 279 | 156 | 152 | 160 | 181 | 226 | 235 | 255 | 258 | |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 9 | E 14 | E 14 | ENE 13 | SW 11 | SSW 10 | SW 10 | SSW 10 | S 9 | S 9 | SSE 9 | S 9 | S 8 | S 8 | S 8 | S 8 | SSE 8 | E 5 | ENE 11 | ENE 10 |
157 | 144 | 250 | 637 | 608 | 725 | 410 | 286 | 240 | 229 | 146 | 106 | 99 | 107 | 107 | 86 | 63 | 23 | 19 | 91 | 123 | |
Swell 3 Height (m) Direction Period (s) | ENE 15 | ENE 14 | ENE 10 | W 10 | W 10 | ENE 13 | ENE 12 | SSE 10 | S 9 | ENE 11 | ENE 11 | SSW 8 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 10 | ENE 9 | ENE 11 | S 8 | ESE 12 |
43 | 70 | 123 | 161 | 89 | 476 | 373 | 250 | 162 | 173 | 167 | 101 | 111 | 109 | 86 | 56 | 37 | 28 | 66 | 28 | 13 | |
Wind waves Height (m) Direction Period (s) | S 9 | S 10 | SSW 10 | S 10 | SSE 10 | — | — | — | — | — | — | — | — | — | — | — | — | E 5 | — | ESE 5 | ESE 5 |
2104 | 2646 | 2529 | 627 | 598 | — | — | — | — | — | — | — | — | — | — | — | — | 19 | — | 21 | 30 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 605 | 605 | 588 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 0 | 28 | 0 | 28 | 28 | 28 | 28 | 17 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.











