Surf Forecasts:
Castles surf forecast from 4 Aug 2026:
- Best quality surf: Thursday 6 Aug, 3AM (local time) - 16ft (5.0m), 18s period, E swell with cross-offshore winds.
- Most powerful swell: Friday 7 Aug, 3AM (local time) - 25ft (7.5m), 18s period, ENE swell with 34,474 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 3AM (local time) - 16ft (5.0m), 18s period with E 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 06) at 3AM. The primary swell is predicted to be 5.0m and 18s period. 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 7.5m 18s and forecast to arrive on Friday (Aug 07) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 13.5m 14s period and expected on Sunday (Aug 09) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Best Surf | 3AM (Thu 6th Aug) | 16ft (5.0m) 18s |
| Most Powerful | 3AM (Fri 7th Aug) | 25ft (7.5m) 18s |
Table - best surf conditions forecast for Castles over the next 16 days.
Short Range ForecastHeavy rain (total 20mm), heaviest during Thu night. Warm (max 30°C on Tue morning, min 28°C on Tue night). Winds increasing (light winds from the ENE on Tue morning, gales from the NNW by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 562mm), heaviest during Fri night. Warm (max 30°C on Sat night, min 28°C on Fri morning). Winds increasing (near gales from the W on Sat morning, extremely windy from the SW by Sun morning). | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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 18 | E 17 | E 17 | E 17 | E 17 | E 18 | ENE 17 | ENE 18 | ENE 18 | ENE 16 | NE 16 | NE 14 | ENE 12 | ENE 11 | ENE 11 | WSW 14 | WSW 14 | ENE 15 | E 14 | ENE 14 | ENE 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2402 | 2840 | 3668 | 4252 | 5602 | 13150 | 20540 | 24620 | 31015 | 28036 | 19580 | 4854 | 1527 | 571 | 105 | 0 | 0 | 71 | 140 | 269 | 313 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | cross-off | cross-off | cross | cross | cross | cross | cross | cross |
High Tide | 10:14AM1.95m | 10:26PM2.02m | 11:06AM1.80m | 11:02PM2.00m | 12:14PM1.65m | 11:47PM1.97m | 1:55PM1.55m | 00:51AM1.93m | 3:58PM1.57m | 2:19AM1.93m | 5:19PM1.70m | 3:48AM2.00m | 6:09PM1.83m | ||||||||
Low Tide | 4:21PM0.73m | 4:57AM0.61m | 4:56PM0.91m | 5:54AM0.62m | 5:38PM1.09m | 7:08AM0.62m | 6:40PM1.26m | 8:38AM0.58m | 8:22PM1.35m | 10:03AM0.46m | 10:04PM1.31m | 11:10AM0.32m | 11:16PM1.17m | ||||||||
 | |  |  | |  | | |  | | | | |  | | | | | | | | |
 | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — |
 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:10 | — | — | 7:09 | — | — | 7:09 | — |
mm | 1 | 1 | 4 | — | 2 | — | 2 | 3 | 7 | 16 | 80 | 156 | 11 | 8 | 56 | 115 | 90 | 30 | 4 | 3 | 4 |
Temp °C | 30 | 30 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 29 | 29 | 29 | 30 | 29 | 29 | 29 | 29 | 30 | 30 |
Feels °C | 33 | 33 | 32 | 32 | 31 | 31 | 27 | 26 | 25 | 19 | 15 | 20 | 25 | 20 | 27 | 10 | 14 | 17 | 20 | 26 | 27 |
Swell 1 Height (m) Direction Period (s) | E 18 | E 17 | E 17 | E 17 | E 17 | E 18 | ENE 17 | ENE 18 | ENE 18 | ENE 16 | NE 16 | NE 14 | ENE 12 | ENE 11 | ENE 11 | — | — | ENE 15 | WNW 15 | WNW 14 | WNW 14 |
| kJ | 2402 | 2840 | 3668 | 4252 | 5602 | 13150 | 20540 | 24620 | 31015 | 28036 | 19580 | 4854 | 1527 | 571 | 105 | — | — | 71 | 11253 | 11736 | 6165 |
Swell 2 Height (m) Direction Period (s) | S 8 | SSE 8 | SSE 8 | SSE 8 | S 7 | — | — | — | — | — | — | — | WSW 14 | NE 15 | — | — | — | — | E 14 | ENE 14 | ENE 14 |
| kJ | 20 | 21 | 32 | 32 | 26 | — | — | — | — | — | — | — | 1010 | 258 | — | — | — | — | 140 | 269 | 313 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NNE 12 | N 15 | — | — | — | — | — | — | NE 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 83 | 116 | — | — | — | — | — | — | 27 |
Wind waves Height (m) Direction Period (s) | — | — | SE 8 | SE 8 | NE 7 | — | N 7 | N 7 | NNW 8 | NNW 10 | NNW 11 | NW 12 | WNW 12 | WNW 12 | WSW 12 | WSW 14 | WSW 14 | WSW 14 | SW 13 | SW 11 | SSW 11 |
| kJ | — | — | 28 | 20 | 105 | — | 727 | 907 | 2032 | 5973 | 16828 | 28766 | 11920 | 20028 | 28066 | 70079 | 72503 | 48240 | 24055 | 7586 | 3289 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 32 | 32 | 32 | 63 | 596 | 596 | 824 | 713 | 596 | 759 | 759 | 713 | 48 | 40 | 713 | 759 | 759 | 608 | 608 | 605 | 605 |
Best forecast wave conditions in Okinawa | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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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