Surf Forecasts:
Castles surf forecast from 31 Aug 2026:
- Best quality surf: Monday 7 Sep, 3AM (local time) - 3.5ft (1.1m), 8s period, S swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 6PM (local time) - 10ft (3.0m), 9s period, E swell with 1,308 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 3AM (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 Monday (Sep 07) at 3AM. The primary swell is predicted to be 1.1m and 8s period with a secondary swell of 1.6m and 5s. The wind is predicted to be cross-offshore 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 Tuesday (Sep 01) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 11s period and expected on Friday (Sep 04) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Mon 7th Sep) | 3.5ft (1.1m) 8s |
| Best Surf | 3AM (Mon 7th Sep) | 3.5ft (1.1m) 8s |
| Most Powerful | 6PM (Tue 1st Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Castles over the next 16 days.
Short Range ForecastHeavy rain (total 55mm), heaviest during Tue night. Warm (max 28°C on Mon morning, min 27°C on Mon morning). Winds decreasing (fresh winds from the E on Mon night, light winds from the ESE by Wed night). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu morning. Warm (max 29°C on Thu afternoon, min 27°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 | ESE 9 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 10 | ENE 10 | E 10 | S 10 | S 10 | S 9 | S 9 | S 9 | S 8 | E 9 | S 8 | E 9 | S 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 222 | 572 | 819 | 1183 | 1225 | 1279 | 1075 | 901 | 1039 | 680 | 468 | 320 | 349 | 397 | 380 | 290 | 235 | 64 | 559 | 59 | 171 |
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 | on | on | on | cross-on | on | cross-on | cross-on | on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross |
High Tide | 8:49PM2.14m | 9:20AM2.11m | 9:16PM2.13m | 10:04AM1.96m | 9:46PM2.09m | 10:55AM1.77m | 10:20PM2.03m | 12:05PM1.60m | 11:05PM1.95m | 2:04PM1.50m | 00:17AM1.86m | 4:13PM1.57m | 2:12AM1.82m | ||||||||
Low Tide | 2:51PM0.53m | 3:08AM0.40m | 3:21PM0.69m | 3:47AM0.40m | 3:52PM0.86m | 4:32AM0.44m | 4:24PM1.04m | 5:28AM0.52m | 5:02PM1.21m | 6:45AM0.61m | 6:09PM1.35m | 8:26AM0.62m | 8:26PM1.39m | ||||||||
 |  |  | | | | |  | | |  | | | | | | |  | | | | |
 | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — |
mm | — | 1 | 4 | 6 | 4 | 14 | 7 | 10 | 9 | 1 | — | 2 | — | 1 | 2 | 1 | 1 | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 27 | 27 | 28 | 29 | 28 | 29 | 29 | 28 | 29 | 29 | 28 | 28 | 28 | 27 |
Feels °C | 28 | 28 | 27 | 29 | 28 | 27 | 29 | 28 | 29 | 32 | 32 | 31 | 32 | 32 | 32 | 32 | 33 | 31 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SW 9 | SW 10 | SW 9 | SW 10 | SW 10 | E 9 | E 10 | SW 10 | SW 12 | SW 11 | SW 10 | S 9 | S 9 | SSW 9 | S 8 | SSW 8 | E 9 | SSW 8 | S 8 |
| kJ | 123 | 94 | 70 | 74 | 101 | 284 | 639 | 685 | 1039 | 809 | 794 | 851 | 412 | 397 | 380 | 490 | 235 | 618 | 60 | 497 | 171 |
Swell 2 Height (m) Direction Period (s) | SW 9 | SW 9 | SSW 8 | SSW 8 | S 8 | S 8 | — | SW 10 | SW 10 | ENE 10 | E 10 | S 10 | S 10 | SW 10 | SW 9 | E 10 | SW 8 | E 9 | NNW 8 | E 9 | SW 8 |
| kJ | 99 | 99 | 27 | 21 | 32 | 18 | — | 804 | 850 | 680 | 468 | 320 | 349 | 260 | 235 | 70 | 149 | 63 | 22 | 59 | 104 |
Swell 3 Height (m) Direction Period (s) | ENE 11 | — | S 8 | S 8 | E 15 | E 14 | — | ENE 12 | — | SSE 8 | S 9 | E 10 | E 9 | E 9 | E 9 | N 8 | E 10 | N 9 | E 14 | NNW 8 | E 13 |
| kJ | 68 | — | 20 | 11 | 18 | 36 | — | 52 | — | 14 | 207 | 226 | 139 | 104 | 81 | 12 | 70 | 64 | 4 | 11 | 52 |
Wind waves Height (m) Direction Period (s) | ESE 7 | ESE 9 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | — | — | — | — | — | — | — | S 9 | — | — | S 8 | — | ESE 5 |
| kJ | 222 | 572 | 819 | 1183 | 1225 | 1279 | 1075 | 901 | — | — | — | — | — | — | — | 290 | — | — | 559 | — | 87 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 719 | 806 | 772 | 596 | 596 | 588 | 28 | 28 | 28 | 17 | 806 | 759 | 92 | 596 | 17 | 28 | 17 | 28 | 28 | 28 | 0 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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