Surf Forecasts:
Castles surf forecast from 20 Aug 2026:
- Best quality surf: Tuesday 25 Aug, 12PM (local time) - 15ft (4.5m), 16s period, E swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6AM (local time) - 15ft (4.5m), 17s period, E swell with 11,236 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 12PM (local time) - 15ft (4.5m), 16s 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 Tuesday (Aug 25) at 12PM. The primary swell is predicted to be 4.5m and 16s 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 4.5m 17s and forecast to arrive on Tuesday (Aug 25) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 11s period and expected on Wednesday (Aug 26) at 6PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Tue 25th Aug) | 15ft (4.5m) 16s |
| Best Surf | 12PM (Tue 25th Aug) | 15ft (4.5m) 16s |
| Most Powerful | 6AM (Tue 25th Aug) | 15ft (4.5m) 17s |
Table - best surf conditions forecast for Castles over the next 16 days.
Short Range ForecastHeavy rain (total 23mm), heaviest during Fri morning. Warm (max 28°C on Sat morning, min 26°C on Fri morning). Winds decreasing (strong winds from the SE on Fri night, moderate winds from the ESE by Sun night). | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Tue afternoon. Warm (max 29°C on Tue morning, min 26°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 7 | S 8 | SSE 9 | SE 8 | SE 7 | SE 10 | ESE 5 | ESE 6 | ESE 15 | ESE 16 | ESE 18 | E 17 | E 16 | E 15 | ENE 14 | NE 12 | E 13 | E 11 | E 13 | ENE 13 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 432 | 684 | 1907 | 780 | 554 | 24 | 111 | 136 | 167 | 854 | 3753 | 7076 | 11180 | 7632 | 3116 | 433 | 168 | 88 | 166 | 55 | 45 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:21PM1.41m | 00:12AM1.77m | 4:51PM1.47m | 1:35AM1.72m | 5:34PM1.58m | 3:15AM1.74m | 5:58PM1.69m | 4:26AM1.83m | 6:20PM1.81m | 5:19AM1.96m | 6:43PM1.91m | 6:03AM2.08m | 7:07PM2.00m | ||||||||
Low Tide | 5:48PM1.34m | 8:29AM0.80m | 7:37PM1.44m | 9:50AM0.74m | 9:50PM1.41m | 10:46AM0.63m | 10:55PM1.28m | 11:29AM0.51m | 11:39PM1.13m | 12:06PM0.40m | 00:15AM0.96m | 12:41PM0.33m | 00:49AM0.80m | ||||||||
 |  |  | | | |  | | | | | |  | |  | | |  | | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — |
mm | 8 | 4 | 2 | 3 | 3 | 2 | — | — | 1 | 1 | 1 | 2 | — | 3 | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 27 | 28 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 29 | 27 | 28 | 28 | 28 | 29 | 29 | 28 |
Feels °C | 25 | 26 | 24 | 26 | 25 | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 33 | 33 | 31 | 30 | 30 | 32 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 9 | SW 10 | SSW 10 | SW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | SSW 10 | ESE 18 | E 17 | E 16 | E 15 | ENE 14 | NE 12 | NNW 11 | NW 11 | E 13 | NW 10 | E 8 |
| kJ | 118 | 325 | 157 | 1028 | 723 | 1470 | 821 | 726 | 892 | 746 | 3753 | 7076 | 11180 | 7632 | 3116 | 433 | 692 | 716 | 166 | 250 | 45 |
Swell 2 Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 9 | ENE 9 | ENE 9 | ENE 9 | ESE 14 | ESE 13 | ESE 15 | ESE 16 | SSW 10 | SSW 9 | SW 9 | SSW 9 | SW 10 | E 11 | E 13 | E 11 | SE 10 | E 8 | ENE 10 |
| kJ | 21 | 20 | 8 | 8 | 16 | 16 | 41 | 35 | 167 | 854 | 540 | 354 | 186 | 236 | 400 | 57 | 168 | 88 | 15 | 35 | 33 |
Swell 3 Height (m) Direction Period (s) | ESE 10 | ESE 11 | — | — | — | E 13 | ESE 14 | ENE 9 | ENE 10 | ESE 13 | — | — | — | SSE 10 | SE 10 | SSE 8 | S 8 | SSE 9 | E 19 | ENE 13 | ENE 12 |
| kJ | 10 | 11 | — | — | — | 14 | 41 | 17 | 19 | 195 | — | — | — | 10 | 16 | 14 | 28 | 26 | 7 | 55 | 30 |
Wind waves Height (m) Direction Period (s) | S 7 | S 8 | SSE 9 | SE 8 | SE 7 | SE 10 | ESE 5 | ESE 6 | E 6 | E 6 | E 6 | ENE 7 | — | N 5 | NW 6 | WNW 7 | W 8 | WSW 8 | W 9 | WSW 8 | W 10 |
| kJ | 432 | 684 | 1907 | 780 | 554 | 24 | 111 | 136 | 91 | 124 | 196 | 161 | — | 37 | 202 | 851 | 1114 | 497 | 1088 | 908 | 1354 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 17 | 588 | 588 | 588 | 596 | 588 | 588 | 687 | 687 | 687 | 776 | 687 | 29 | 29 | 29 | 5 | 5 | 29 | 17 | 28 | 31 |
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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